Mitutoyo Electronic Internal Caliper Gage These internal caliper gages are designed for measuring Internal Diameters that might be difficult to get to. They are also often galled a Groove Gage because of their perfect design for measuring IDs on internal grooves. Features include... 1.97" - 2.746" / 50-70mm Measuring Range 0.0005" / 0.01mm Resolution 0.0015" / 0.02mm Accuracy 3.3" / 85mm Max Measuring Depth Ball 0.039" / 1.0mm Radius LCD Analog / Digital Display IP63 Rated Protection SPC Output Function Include... Zeroset Preset Auto Power Off In / Metric Conversion Data Hold Min / Max Value Hold