The Barcor Hole Gage is a precision instrument designed to instantly give you a diameter reading in less than two seconds. Merely insert the precision ground, hardened tool steel Gaging Plunger into the hole, press the base of the gage firmly against the part and read the dial directly in .001" or .02mm diameter increments on the dial face.
The Hole Gage is a direct reading gage. No Setting Master (Standard) or look-up chart is required. To check the setting, press the base of the gage against any flat ground surface and adjust the dial to read the ?Set To? number stamped on the back.