The Starrett 910 Deluxe Padded Case is sized to store and protect a single outside micrometer that measures to 1 inch (25 mm). The case has rounded edges, is made of steel with a vinyl covering, and has fitted foam padding to house a micrometer and adjustment wrench (sold separately). The case is an accessory for use with a Starrett micrometer that measures to 1 inch (25 mm) in the series 221, 226, 226M, 230, 23M, 426, 436.1, 1230, or 1230M (sold separately).

Outside micrometers may also be called micrometer calipers, and are precision measuring instruments used to measure the length, width, or outside diameter of an object.

The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company was founded in 1880 and is headquartered in Athol, MA.