INSIZE Electronic Depth Gage w/ Round Depth Bar Allows you to do the following depth measurements... Depth Measurements of Small Holes ( >.157") Measure Depth of Grooves Inside Bore Measure Width of Grooves Inside Bore Features include... 0-4" / 100mm Measuring Range 0.0005" / 0.01mm Resolution 1.772" Base Stainless steel Buttons: power on/off, inch/mm, Preset (+,-) Battery CR2032 Data output Supplied in fitted storage case Includes 3 interchangeable contact points - Flat, Spherical, Disk