Performs easy and accurate measurement of narrow or recessed areas, plus inside and outside diameters that dial indicators cannot access. Resistant to water and dust thanks to the one-piece bezel and crystal design with O-ring. The glare-free flat crystal face has a scratch-resistant coating. 0-40-0 Scale, 8mm Stem, Stylus 2mm Contact Point, 20.9mm Length, Anti-Magnet, Jeweled Bearing