Draper dual reading digital external micrometer The Draper 46600 is a dual reading digital external micrometer. It is expert quality, with an enamelled frame, heat plates, satin chrome thimble and sleeve. Carbide tipped measuring anvils, lock and ratchet stop. Graduations 0.001mm and 0.0005\". Perfectly flat ends for accurate measurements. Supplied with SR44 battery.  Features: Expert Quality, with enamelled frame, heat plates, satin chrome thimble and sleeve  Carbide tipped measuring anvils, lock and ratchet stop  Graduations 0.001mm and 0.0005\"  Perfectly flat ends for accurate measurements Supplied with SR44 battery Specification: Range: 25-50mm