The heads are built to be self-centering for reliability. All these micrometers have easy to read graduations of 0.0001 inch. And the best thing is you won’t even have to remove the pistons while measuring. And if you’re not familiar with it, you can picture it as a device that measures the depth of the bore and its diameter. Electronic gauges are easier to read in general, but some don’t like the digital interface. FREE Shipping on orders over $25 shipped by Amazon. You’re sure to get all the dimensions on point when you’re using this. More accurate sizes can be measured with dial bore gauges, used extensively in the automotive industry. • Supplied in a fitted pouch. Each of the gauges has a knurled clamp for a more secure grip. The contact points of the gauge are covered with a carbide coating to give it a greater resistance against wear. Each of them is hardened and comes with a carbide anvil, thereby ensuring durability. 6 Pcs 5/16" to 6" Telescopic Gauge Bore Gauge Telescoping Gage Set High Precision T Bore Hole Gauge Bore Measurement Tool. Copyright 2020 © Starrett . A good dial bore gauge is good to perhaps a few tenths, and they’re faster and require much less touch than telescoping gages. Spring-tensioned telescoping arm. You can buy inexpensive dial bore gauges from Enco. Another great addition we have for this list is the high precision inspection set from Accusize Industrial. Usually, it is used for measuring car cylinders when looking for replacement parts. The gauge is then locked in place and removed from the hole. All your measurements should be accurate, and the gauge you use should be able to do that. Aside from that, it also boasts of its high durability and user-friendliness. Ouch, what about the cost? It can also measure diameters with a range of 1.4 to 6 inches. Related Review: Omega 300 vs. Silencerco Hybrid. It can also measure huge bore diameters ranging from 0.7 inches up to 6 inches. Anytime Tools 2" - 6" Electronic Digital Precision Engine Cylinder Hole Bore Gauge Resolution... Best Scope For 17 HMR Review in 2020 – New Edition. Save telescoping bore gauge to get e-mail alerts and updates on your eBay Feed. It's very accurate though. They also come in a neat chrome satin finish for added durability. The Starrett 579 Telescoping Gage is used for determining the true size of holes, slots, and recesses up to 6" (150mm). The graduations on the dial face are by 0.0005 inches to enhance the accuracy of your measurements and lessen any chances of slight offset errors. Also, this can help minimize the effects of abrasion. Fowler - 52-646-400-0 Full Warranty Extender Dial Bore Gage Set, 52-646-400, 1.4-6" Measuring... 6 Pcs 5/16" to 6" Telescopic Cylinder Bore Gauge Set,Telescoping Gauge Set High Precision T... iGaging Dial Bore Gauge 2"-6"/0.0005" Deep Engine Cylinder Measurement. I run to the machine shop to use their setting gauge. This high-precision tool has a lot of applications. Using the telescoping gauge is fairly easy. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. PRECISION, QUALITY, INNOVATION. Also, it can measure the exact size of the outer diameter of the hole. Choose a gauge that’s lightweight and has a secure grip handle to prevent any slips. About Us           Contact Us            Privacy Policy, As an Amazon Associate, I earn from qualifying purchases. It is a high-precision gauge, and it’s also very easy to use because it has a digital display. In conjunction with a micrometer, a bore gauge will give you the exact reading of a bore size. 5% coupon applied at checkout Save 5% with coupon. Get to know if the gauge has features that help it become resistant to wear or abrasion. Bore gages measure inside hole diameter with high accuracy. There are also jewel bearings inside the dial indicator. 4.4 out of 5 stars 23. A higher depth measurement range is better since you won’t have to look for any extensions. It also comes with a contact system that uses two points to detect any shape irregularities for the cylinder. This site uses Akismet to reduce spam. This product can measure bores of up to 6 inches in depth. The dial face has a graduation of .0005 inch. If your device features such, then it will most likely give you an accurate number. Its measuring plunger has a carbide tip, and this gives it more resistance to wear and enhances its protection against abrasion. Telescoping gauges and sets are used to determine the inside diameter of a bore or hole. The ends of the rod are the shape of a half ball, called the radius edge. All the measurements you’ll be getting are sure to be accurate by 0.0008 inches and have a precision of 0.0001 inches to ensure minimal errors. The tool must be slightly rocked in the hole being measured to ensure that the tool is on the proper diameter before it is locked and withdrawn. This video shows how to use telescoping bore gauges and micrometers to get accurate inside measurements. Push-Pull Gauge… The ends of both contacts are heat treated, satin chrome finished stainless steel and precision ground to a radius to allow proper clearance on the smallest hole the gauge will enter recesses up to 6 in. Save my name, email, and website in this browser for the next time I comment. 8% coupon applied at checkout Save 8% with coupon. The next one on our list is known to have high accuracy that makes it suitable for various industrial applications. The smaller, the better. The micrometers are very useful when it comes to measuring the thickness and length of very small objects. This device is versatile enough that you can use it to measure the taper of the cylinder and know whether it’s wider at the top or the bottom.The out-of-round measurements can also be determined to know if the cylinder is perfectly round or if it is oval-shaped. Stark 6-piece Telescopic Gauge Caliper Set features a double action rigid handle with self centering for quick checking of holes, slots. For more information go to: Without a doubt, this is a good option! Extender Dial Bore Gauge Set 50-160MM (1.97"-6.23")Indicator 0.01MM(0.0003") Resolution Internal Measure Cylinder Tool 5.0 out of 5 stars 2 $69.99 $ 69 . Considering all of its features, this tool is undeniably a must-have! Dial Bore Gauge Accuracy. These typically work similar to the telescopic bore gauges with a two point contact, however they include a connected gauge so a direct measurement can be taken from the object bore. Learn how your comment data is processed. Athlon vs Vortex Riflescope – What’s the Difference? The telescoping gauge set takes quick and accurate inside measurements from 5/16 in. To ensure accuracy, see the graduations used by the gauge. With this, you can measure the depth of up to 6 inches without the need for an extension. Here are the basic features for Starrett telescopic bore gauge: Contact ends are hardened and ground to allow proper clearance. Get it as soon as Fri, Nov 20. This large depth measurement range is very useful when determining the length of the cylinder’s taper and its out-of-round. It may be challenging to make the right decision, especially if there are so many gauges to choose from. This device usually comes in a compact size as well as different forms– analog gauge or a digital gauge. Its spring-loaded plunger makes it possible for it to expand inside the bore. $19.99 $ 19. 99. Much more, its contact point can be interchanged. You can even go as far as reaching the cylinder’s critical wear area. 6 Pcs 5/16" to 6" Telescopic Gauge Bore Gauge Telescoping Gage Set High Precision T-Bore Hole Gauge Minimeter Measurement Bore. It comes with five telescopic gauges that range from 0.5 inches up to 6 inches. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for website owners to earn advertising fees by advertising and linking to Amazon(.com,, .ca etc) and any other website that may be affiliated with Amazon Service LLC Associates Program. It’s this shape that’s responsible for the telescopic gauge’s accuracy. Lumenok vs. Nockturnal – Comparison in 2020. It has all the tools you will need for measuring bores easily with higher accuracy. Also, it only has very minimal influences of frictional force, which can affect the precision of your measurements. But basically, you just zero the gauge, insert it to the bore to a specific depth, and rock it back and forth to insert it to the pipe. that my gauge reads 2 thousandths off. The general rule for calibrating measuring equipment is to do it at least once a year. Well, the standard graduation for most gauges is 0.0005-inch. Bergara B14 vs. Remington 700 Comparison 2020, Cover doesn’t perfectly fit the indicator, Displays measurements in both Metric and English units, Some users don’t like the product’s packaging, Can’t detect shape irregularities as effectively, Not ideal for checking bearing clearances. Most vehicles today have very tight allowable clearances, so there shouldn’t be even slight errors in the dimensions of your replacement parts. Known for its precision and durable components, you will never go wrong with choosing this bore gauge. These high precision gauges are specially designed to measure the dimensions of holes. Telescoping Gage Set Series 155. The telescoping gauge set features spring loaded, self centering plungers and twist knobs for measurement locking. Smooth adjustment, spring … We’ll try at least. 99 Not to mention, you can also use it for cylinders. The contact point is made with a stainless steel ball for better durability. + Update your shipping location 7 S 0 P O N S O A R P A 7 E E D-1-1 U J-1 0 F J-1-1. This also comes with an aluminum case so you can keep your gauge and all your other accessories safely. With its high precision measuring capability, you’ll be surprised to know that it comes at a very affordable price compared to other products on the market. It provides a comfortable grip and is very lightweight so you can obtain maximum convenience and ease of bringing it in your workplace. FREE Shipping on your first order shipped by … Bores from 12 – 150mm are measured with telescopic gauges sets. 99. It’s definitely the right bore gauge for your money! With a bore gauge, you are sure to get more accurate data. Its manufacturer is well known for its high-quality gauges, and it certainly did not disappoint with this one. Beyond doubt, this is perfect for measuring taper and out-of-round of cylinders. Look for the extent of the diameters it can measure as well as the maximum depth it can reach. So you won’t have to remove the piston while measuring. I know from exp. Its 2-point contacts are made more durable using carbide so it can handle the wear from frequent usage. Masukkan telescoping gauge ke lubang yang akan diukur. There are a few ways to get your hands on dial bore gauges without totally breaking the bank. This also means that there is no need to apply lubrication even in corrosive environments. 1-1/4 to 2-1/8 Inch, 3 Inch Overall Length, Telescoping Gage 2-3/8 Inch Long Handle, Satin Chrome Finish MSC# 86420999 Starrett (52613) In Stock It is very easy to adjust and has a tight gripping handle, so you’re safe from any slips. Also, this is lightweight and also comes with a secure grip. They also come in handy when measuring a cylinder’s out-of-round, taper, and outer diameter. As world leading manufacturers of bore measuring tools, Bowers Group produces the most comprehensive series of bore gauges and internal measurement equipment available. INSIDE MICROMETERS are also used with only 2 point contact, generally from 25mm upwards in diameter. This bore gauge is one of Fowler’s best products for many reasons. It has all the tools you will need for measuring bores easily with higher accuracy. to 6 in.. David has described the best way to use telescopic bore gauges, I have a set of Mitutoyo which were bought second hand many moons ago, I find they give better accuracy than earlier posts, but then I have been using them for many years. The long rods make it easy to reach inside bores. It assures that there is very minimal room for error. FREE Shipping on orders over $25 shipped by Amazon. Also, a tool that includes a chart for easy selection can also be chosen. If you don’t like analog displays, you can always opt for an electronic gauge for easier measurement reading. Not only that, but it also comes with a spring-loaded centralizing foot that helps the gauge remain in the center.  by Proreviewbuzz, Best Bow Press 2020 REVIEWS – Buyer’s Guide, Best Fletching Jigs Reviews 2020 – Buyer’s Guide, Best Mathews Bows Reviews 2020 – Buyer’s Guide, Best Camera To Film Your Own Hunts Reviews 2020 – Buyer’s Guide, Best Multi Caliber Suppressor For The Money – ( 2020 Review ), Best 5.56 Suppressor Reviews 2020 – Buyer’s Guide, Best 300 Win Mag Suppressor Review 2020 – New Edition, Best AR 15 Suppressor Reviews 2020 – Buyer’s Guide, Best 458 SOCOM Upper Reviews 2020 – Buyer’s Guide, BEST AK SUPPRESSOR Reviews 2020 – Buyer’s Guide, 10 Best Handguard for Suppressor 2020 Reviews, Fowler Full Warranty 52-646-300-0, 6" Cylinder Dial Bore Gage with Carbide anvils. I bought a set of the Dasqua telescopic bore gauges last week for job that was outside of the range of my assortment of M&W and Mitutoyo gauges. This very small graduation gives your measurements better accuracy. Since it is an electric bore gauge, you can choose a variety of units of measurement, either in inches or in terms of the metric system, whichever you are comfortable with.To detect if the cylinder has an oval or circular shape, it provides a two-point contact feature. With this, you’ll be sure to get all your cylinder measurements right every time. 6 Pcs 5/16" to 6" Telescopic Cylinder Bore Gauge Set,Telescoping Gage Set High Precision T-Bore Hole Gauge Minimeter Measurement Bore. Some include a three anvil system for higher accuracy. Much more, this comes with a fitted case to ensure that the instrument is organized and safely stored. With a measuring gauge of 1.4 to 6 inches, it can measure large holes and cylinders. Much more, it comes with a sturdy cover, thereby adding to its durability. But before you go ahead, it is important to know the exact measurements of your engine components. With its high accuracy and its durability, you will be sure to get the best value for your money. You can use the telescoping gauge set for measuring the internal dimensions of a bore. Telescopic gauges have many applications, but it is mainly for measuring the internal diameter of a bore. Another great addition we have for this list is the high precision inspection set from Accusize Industrial. Much more, the gradient spacing it uses for measuring is 0.00005 inches. 4.3 out of 5 stars 20. All the anvils are marked with a laser so you can easily select the one you need. These are a range of gauges that are used to measure a bore's size, by transferring the internal dimension to a remote measuring tool. I usually measure over the gauge with a digital vernier. It will also lengthen its service life. You can measure a pretty deep bore of up to 10 inches in depth. First, you could simply buy sizes as needed. This gauge set is complete with unique features to help you measure bores and cylinders easier. As only the good bore gauges can give you the desired result, we’ve compiled a list accordingly. And it includes a micrometer set, dial bore gauge set, a telescoping gauge set, and a set for measuring small holes. With this, you are ensured of an accurate, lightweight, and compact device. Get it as soon as Mon, Nov 9. Dial Bore Gauge. They’re both inexpensive and easy to use, and suitable for deep holes, but they’re also less accurate than other types of bore gauges. Aside from that, there is a gage chart to guide you with your anvil selection. Well, it all depends upon your preference! Our Central Tools and Aircraft Tool Supply Full Ball hole gauges measure much smaller diameters, from .125 to .500 inches. The final hole size is obtained by measuring over the gage contacts with a micrometer. Telescoping Gage, 1-1/4 - 2-1/8"/32-54mm Range, 2-3/8"/60mm Handle Length, WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer, and birth defects or other reproductive harm. The ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gage will enter. Spotting Scope vs Binoculars – Which One Should I Get? Also, it has a dial indicator that holds jeweled bearings. Remington 700 ADL vs. BDL – Which One Is Best? Suggested Topic: .22 LR Rifles and PIstols. 1 1/4-2 1/8" (32-54mm) Range, 2 3/8" (60mm) Handle. This is because of its high gauging depth of up to 10 inches. It includes 6 pieces of tools that can measure with different ranges. You can employ this high-performance tool to your engine’s cylinder to get its exact bore size, taper, and out-of-round measurements. Copyright 2020. Besides, not all of them come in perfect circles as some have oval shapes. It also can measure a hole that goes as deep as 6 inches. That’s far more than how deep other gauges can reach. However, some manufacturers may have different calibration cycles for their products, so make sure to check the information manual of your device. It also comes with a space at the bottom for an extension holder. The telescopic rods are what measure the distance of the bore, with the help of a micrometer. Try our Travers Tool or Aircraft Tool Supply telescoping gauges, offered in a range of sizes to fit your engine type. This will surely give you an optimum experience when using the gauge. If you want the bore gauge, then any of the ones on this list is a great choice. The information you provide will be used in accordance with the terms of our, Thank you for submitting a product testimonial on. They are a direct equivalent of inside calipers and require the operator to develop the correct feel to obtain repeatable results. This is easy to do with the help of a handy tool known as a bore gauge. The ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gage will enter. This will depend on your preference. Since this device uses anvils that are made of carbide, it provides more protection from wear. Also, it allows you to carry it anytime and anywhere. Bore Measuring Telescoping Gauge TBMT-2300-X-10 - Range 1.25" to 10" (32 mm - 254 mm) The telescoping gauge measures the I.D. You will be able to measure bore depths ranging from 0.7 inches up to 6 inches, just perfect for measuring your cylinder’s taper. This will ensure that it will be able to handle the damage that comes with frequent usage. The ends of the rod are the shape of a half circle (called the radius edge), which is responsible for getting accurate … With this guide, you are ensured that all the products on the list are top-notch. And it’s also hardened to resist wear due to frequent use so you can use it for a longer period.This has a very affordable price range, so you won’t have to worry about going over the budget. Precise measurement is a non-negotiable factor when it comes to bore gauges, and slight errors can result in unnecessary damages. Series 155 Features • Spring-loaded plunger expands within the bore (or groove), allowing determination of the internal diameter (or groove width). All rights reserved. 99. Precision ground radius on each gauge. Hopefully, you already have one in mind after reading through the pages! This can also be used to determine other shape irregularities for the taper. Let’s begin! .076X.100X2.500X.012X70, iy_2020; im_12; id_01; ih_21; imh_15; i_epoch:1606886136292, bec-built-in; bec-built-in_1.0.0; bodystr, pn_tstr:Tue Dec 01 21:15:36 PST 2020; pn_epoch:1606886136292,, sdk.environment=production;sdk.charset=UTF-8;api.endpoint=;sdk.account=f00000000167983;sdk.connectTimeout=500;sdk.socketTimeout=500;sdk.crawlerConnectTimeout=750;sdk.crawlerSocketTimeout=750;whitelist.parameter.list=ixf;flat.file=true;sdk.proxyPort=0;sdk.proxyProtocol=http;crawler.useragents=google|bingbot|msnbot|slurp|duckduckbot|baiduspider|yandexbot|sogou|exabot|facebot|ia_archiver;forcedirectapi.parameter.list=ixf-api|ixf;;page.independent=false;page.alias.url= This is perfect if you’re not into analog gauges. The gauge can then be extracted, and the size of the extended head can be measured with a micrometer or vernier … The Starrett 579 Telescoping Gage is used for determining the true size of holes, slots, and recesses up to 6" (150mm). of the bore through an open broached tool port in the B&D boring bar. Marlin Vs. Henry Rifles – Which One Is Best? Aside from accuracy, it has wide measurement ranges so you can measure bores and cylinders of slightly larger sizes. $20.99 $ 20. Range Micrometer Precision T-Bore Hole Gauge (6-Piece) 25 mm x 50 mm x 75 mm Steel-Hardened Metric Precision 123 Gauge Blocks (2-Pack) 1.5 in. This can effectively measure the inner diameter of holes from smaller to larger sizes. A dial bore gauge is a special tool, calibrated in .001 inch (.0025 centimeter) or .0001 inch (.00025 centimeter), which is used to accurately measure the inside diameter of a hole, cylinder or pipe. • With a knurled clamp. That said, the item you need with a dial bore gauge is a setting tool. The operator turns a knob or releases a trigger to simultaneously extend the contacts outward until the wall is touched by all contacts. Click here to see TELESCOPIC GAUGES page. It is very easy to use, and it already includes an extension holder in case you want to measure a cylinder with greater depth. Dial bore gauges are both easy to use and accurate, as well as good for measuring how deep bores taper. How to use telescopic gauges. D. As a rule I don't buy cheap tools but considering the job in question and my inquisitive nature, I bought the Dasqua gauges from Chronos via ebay for £20.00. SINCE 1880. It can be utilized to measure the taper, out-of-round, and bore size of your cylinder. Starrett S579GZ Self Centering Telescoping Gauge With 2 Telescoping Arms Set, 5/16" - 2-1/8" Range, 2-3/8" Handle Length (4 Pieces) 4.5 out of 5 stars 19 $156.32 $ 156 . Unlike other products on this list, this set only consists of telescopic gauges, and is perfect for measuring the diameter of cylinders and other bores. We’re not gonna spam. Telescopic bore gauges send the measurement to another tool, often a micrometer, to display. It has a two-point contact system that can detect if the shape of the cylinder is not perfectly round. Choose from our selection of bore gauges, including Mitutoyo dial hole gauges, Starrett telescoping hole gauge sets, and more. $19.99 $ 19. This highly accurate gauge is one of the best choices you can go for in the market. Get it as soon as Wed, Dec 2. It also has a strong carbide tip that increases its resistance to wear and keeps it safe from abrasion. It also has other features that make it easier to use. Not to mention, they are all durable and have a rigid handle. With the help of a micrometer, the telescopic rods measure the distance of the bore. It is also very small in size and is lightweight, so it only experiences minimal friction. And it has an integrated bezel lock that is easily adjustable for zero settings. It’s also very easy to use. They are inserted into bore holes and controlled by a knurled knob or small handle that expands the telescoping arm or arms until the spring-loaded plungers make contact with the sides of the bore. If you’re looking for a bore gauge with the highest accuracy, this device from Fowler may be a good choice. If your car engine doesn’t perform efficiently like it used to, then it might be time for a replacement. Top manufacturers and models for telescopic bore gauges Starrett telescopic bore gauge used for internal diameters and bores. This device from Mitutoyo has everything you will need from a bore gauge. Analog gauges are easy to read, but if you don’t like having to look at the dial indicator, then you can always go for the digital. The accurate measurement of bores and holes is essential in a variety of industries involving precision engineering where strict tolerances are required. Goyang-goyangkan telescoping gauge agar tepat pada bagian tengah lubang untuk mendapatkan ukuran diameter lubang yang tepat. They might go to waste if there is an offset in the size of the parts you buy. And it includes a micrometer set, dial bore gauge set, a telescoping gauge set, and a set for measuring small holes. The tool must be slightly rocked in the hole being measured to ensure that the tool is on the proper diameter before it is locked and withdrawn. For extremely precise measurements, our Fowler dial bore gauges … When put to the test in measuring hollow cylinders, the accuracy was on point. Not to mention, this also helps to keep it safe from abrasion. Although gauges are rarely exposed to large forces, that doesn’t mean they should be built with less durability. Other factors are necessary for a gauge such as durability and measurement range. With the features this gauge has, you won’t have to look any further. Lepaskan telescopic plunger dengan cara kendorkan locking screw agar telescopic plunger dapat mengembang sesuai dengan ukuran lubang yang akan diukur. Only 18 left in stock - order soon. In stock and ready to ship. Bore gauges have tons of applications, and to get the best one, you need to check all the features they come with. Dial bore gauge, what are they and how do they work, in this video we'll see how to calibrate them and how to measure using them. 32 $166.00 $166.00 It can give you highly precise measurements so you can make sure all the replacement parts you’ll buy will fit perfectly well and not end up going to waste. For sure accurate measurements, the graduation is set at 0.0005 inches. Bores and cylinder can be measured up to a depth of 6 inches. There are six available tools you can choose from its micrometer set. Bore gages are selected by measurement range, depth, accuracy requirements and number of … For added accuracy, the gauge is designed to have a graduation of 0.005 inches, and it has a marker for tolerance on the indicator. I have a dial bore gauge that reads from 2 to 6 inches. With this, you can surely get the exact measurements compared to traditional methods. Not to mention, this is also ideal in measuring the depth of up to 10 inches. There are telescopic gauges with two plunging telescopic rods and others with only one. How to Use a Scope for Long Range Shooting? The contact points have carbide tips to ensure more strength and higher resistance to the wear and tear of frequent use. This makes it durable enough to stand for a longer period. It also has a locking feature to keep the gauge stable while you’re trying to insert it to the part you want to measure. They are also easy to adjust and have an insulated grip. There are specific instructions in using dial gauges from different manufacturers. Also, look for a device that comes with unique features that promote ease of use. All cylinders come in plenty of sizes, so your gauge should be able to accommodate most if not all of them. This adds to its overall measuring accuracy. It is spring loaded so the operator can get an exact measurement (within .001") without having to remove the boring bar from the bore. Graduations on the dial are as small as 0.01mm to ensure minimal errors in your measurements. Anytime Tools Bore Gauge 6 pc 5/16"-6" Premium Telescopic High Precision T-Gage Set w/Hard Shell Case 6 Pieces range: 5/16" - 6". The contact points use carbide for wear protection and for enhancing its resistance to abrasion. Gage Multiplexers, Amplifiers and Displays, Durometers, Ultrasonic Thickness Gages, and Coating Thickness Gages, Durometer, Ultrasonic Thickness Gage and Coating Thickness Gage Accessories, Precision Rules, Straight Edges & Parallels, Accessories for Diamond Hole Saws & Tile Drills, Bi-Metal Pneumatic Reciprocating Saw Blades, SPRING, They are very good. For instance, opt for one that has an easy to adjust settings. A telescoping gauge is an indirect measuring device, the head of which can be positioned inside holes or openings and then extended to touch the walls. The dial face is composed of 0.0005-inch graduations for optimum precision. It can also maximize the accuracy of your measurements because it can detect pressure even in the smaller areas. More amazingly, it is also very easy to use. - 6 in. Telescoping Gauge Set 5/16 in. So, before you go and buy one, make sure you have checked the following features. Anytime Tools Dial Bore Gauge 0.7"-6"/0.0005" Deep Engine Hole Cylinder Measurement Gage, Ginode 5/16" to 6" 6 Pcs Telescoping Gage Set Range Micrometer Precision T-Bore Hole Gauge. So, if you’re looking for a product that can provide you with the utmost functionality, this set may be a good choice! This gauge stands out from the rest because of its super-precise measurements. Last update on 2020-12-02 / Affiliate links / Images from Amazon Product Advertising API. Well, this has a very high accuracy rating compared to other tools in the market. This is the most important factor. Well, it is great for measuring tapers and out-of-round of cylinders.