Graduation: .0001". Measure the groove diameter of shafts and keyways. Non-rotating spindle.Ratchet stop. Supplied with setting standards (except 0-1").
Graduation: .001". Micrometer head accuracy: ±.00012". Rod accuracy: ±[.001+.0005(L/3)]", L is the measuring range in inch. Rods with flat end. Ratchet stop.