■ Measure the groove diameter of shafts and keyways ■ Resolution 0.001mm/0.00005" ■ Non-rotating spindle ■ Button: on/off, set, mm/inch, ABS/INC, data output ■ Automatic power off ■ Data output ■ Ratchet stop ■ Supplied with setting standards (except 0-25mm/0-1'')