Enameled metal body with satin chrome thimble. Outside micrometer has 0-1" range. Digital read out to .001" plus a Vernier scale for total resolution to .0001". Accuracy: .0001". Thimble lock for measuring like objects. Adjustment wrench included with fitted wooden storage case. Powered by a 1.55 Volt Silver Oxide SR44W cell battery with automatic shut-off (included).