The tool operates as a Go/No-Go Gage and as a limited run, sensitive, indicating micrometer. Indicating accuracy to .00008". Minimum dial reading .0001" or .001mm. Carbide faces. Jeweled bearings. Vernier scale on the barrel. Spindle diameter .315" (8mm). Anvil and spindle hardened and precision ground - with the micro-lap finish on measuring faces. Spindle clamping ring. Clear graduations on the satin-chrome finish. Every thousandth is numbered for easy setting. All parts subject to wear fully hardened. Retracting button convenient to the operator's thumb. Tolerance hands can be set as desired. Wider graduation for easy reading. Quick and easy zero adjustments. Complete with a fitted carrying case.