"Go" and "No-Go" gage and can also take the place of snap gages on limited runs.  Indication accuracy to .00004"/.001mm, graduated in .0001"/101mm.  Spindle & thread are hardened, ground and lapped.  Features carbide faces with a satin chrome finish.  Uniform pressure is exerted at all times.  Tool has tolerance hands with minimum dial reading of .0001"/.002mm.