Fowler 52-245-502 Indicating Micrometer,  1-2" Measuring Range, + or - 0.20" Dial Reading, 0.00005" Graduation, 0.00015" Accuracy Indicating micrometer with a choice of measuring range and a 0.020" dial range is designed for use as a comparator or Go/No Go (Go/NG) gauge for comparing parts with tight tolerances Balanced dial has tolerance indicators, 0.00005" dial graduations, and an accuracy of 0.00015", and Vernier scale has 0.001" graduations for precise measurements Hardened, precision-ground, and carbide-tipped measuring faces are micro-lapped to provide wear resistance and accuracy Retracting button is close to the operator's hand, and anvil retracts 0.060" for quick release Insulated frame with satin chrome finish helps reduce temperature-related expansion or contraction