Starrett No. 436 Mechanical Outside Micrometer

The Starrett No. 436 Mechanical Outside Micrometer measures external dimensions from 2 to 3 inches and uses a ratchet thimble to apply consistent pressure for repeatable readings. This 2–3" outside micrometer is a precision instrument well suited to metalworking and manufacturing environments where accurate checks of external dimensions in the 2–3" range are required. An accuracy specification of -0.0001 Ac is listed for this model, indicating tight dimensional tolerances for parts within its measuring span. The ratchet mechanism minimizes operator-induced variation, helping ensure that successive measurements in the same setup are comparable. Being a mechanical tool, it provides readings directly from the scale, which is useful for routine gauging tasks in setups without electronic readouts.