The Fowler 52-253-102-1 Outside Metric Micrometer with 1-2" measuring range has a 0.256" diameter for general purpose measuring. The Vernier scale has 0.001" graduation intervals and ±0.001″ accuracy for precise and accurate readings. The carbide-tipped anvil/spindle pair has hardened, precision-ground, and micro-lapped measuring faces for accurate measurements. 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.