Electronic Internal Caliper Gage This type of gage is perfect for measuring bores, internal grooves, and other hard to reach inside dimensions. Specifications include... .200" - 1"/5 - 25mm Measuring Range 0.0002" / 0.005mm Resolution + 0.0008" / 0.02mm Accuracy Ball Contact Points Features include... Preset Origin for absolute measurement Origin data recall Absolute and incremental measurement Auto power off Furnished in fitted case