Starrett DY093 External Micrometer, Range 1 →2 in

Micrometer which is graduated in thousandths, but has an additional series of graduations on the thimble and sleeve which allows readings down to ten - thousandths of an inch or two thousandths of a millimetre.

Tapered frame - for measuring in narrow slots
Spindle locknut - simple accurate operation
High micro mirror finish - On anvil & spindle face
Hardened thread