The Fowler 54-860-241-0 IP54 Electronic Blade Micrometer with 0-1"/25mm measuring range is used for measuring the outside diameters of workpieces with narrow grooves, T-slots, and other dimensions blocked by shoulders or lands inaccessible by standard micrometers. It features a large, easy-to-read LCD that performs direct inch/metric conversions and has a switchable resolution of 0.00005" and 0.001mm. The friction thimble provides smooth and quiet performance and is suitable for one-handed operation. Fowler, an American company, manufactures premium inspection and measurement instruments like electronic indicators, calipers, bore gages, and micrometers. The company, founded in 1946, is headquartered in Canton, MA.