Performs easy and accurate measurement of narrow or recessed areas, plus inside and outside diameters that dial indicators cannot access. No-clutch structure for automatic reversal of measuring direction. Resistant to water and dust thanks to the one-piece bezel and crystal design with O-ring. 0-15-0 Scale, 3/8" Stem, .079" Contact Point, 19.9mm Length, Anti-Magnet, Jeweled Bearing.