Draper expert dual reading digital external micrometer 0 25mm 0 1 draper expert 46600 b i expert quality i b with enamelled frame heat plates satin chrome thimble and sleeve carbide tipped measuring anvils lock and ratchet stop graduations 0 001mm and 0 0005 ball end cap for measuring curved surfaces supplied with sr44 battery display packed in plastic storage case draper expert 46600 dual reading digital external micrometer 25 50mm 1 2