Electronic - External Caliper Type Gage Features include... Measuring Range: 0.0 - 0.80" Resolution: 0.0005" / 0.01mm Accuracy: + 0.0008" / 0.02mm Contact Point: 1/16" radius chisel x 0.200" wide Includes Certificate of Calibration Specifications include... Dimension "A" : 0.256" Dimension "B" : 0.985" Dimension "L" : 3.150"