Outside micrometer with 0 to 1" measuring range and disc-style anvil/spindle pair measures thickness of narrow grooves and difficult or closely spaced areas, such as slots and recesses
Vernier scale has 0.001" graduations and an accuracy of 0.00016" to provide precise readings and accurate measurements
Hardened, ground, and micro-lapped anvil/spindle pair provides wear resistance
Positive locking lever locks measurement in place for accurate reading
Ratchet stop applies constant force for repeatability between users