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... 0.10" - 0.49" / 2.5-12.5mm Measuring Range 0.0002" / 0.015mm Resolution 0.0008" / 0.08mm Accuracy 0.47" / 12mm Max Measuring Depth Chisel 0.0039" / 0.1mm 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