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.