Electronic Internal Caliper Gage This type of gage is perfect for measuring bores, internal grooves, and other hard to reach inside dimensions. Specifications include... 0.80" - 1.60" / 20-40mm Measuring Range 0.0002" / 0.005mm Resolution + 0.0012" Accuracy 0.0004" Repeatability 3.150" Tip Arm Length 0.236" Tip Height 0.118" Tip Width .020" Radius Ball Contact Points 2.362" Diameter Display Features include... Display rotates 170° Functions include... Go / No Go Display, Data Preset, Min / Max, Abs / Incremental Data Output Furnished in fitted case