Electronic Depth Gage Features include... 0-6" Measuring Range Large LCD display for easy reading. Linear scale embedded in stainless steel blade. Base Dimensions: 3.94" L x 0.28" W Minimum Bore Dia: 0.812" Resolution: 0.0005" / 0.01mm Accuracy: 0.001" / 0.025mm Certificate of Calibration Furnished in fitted case.