Quality lever test Indicators (in compliance with the DIN 2270 standard). The structure is without friction that allows automatic reversal of the stylus direction of rotation. The roating bevel and crystal, built in a single piece increase resistance to water and dust. Anti-reflective crystal with anti-scratch coating. Rotable bezel for zero setting. High precision movement mounted on rubies and bearings, gears and pinions that guarantee fluid movements, silent, rapid and precise measurements. Ø 2mm hard metal sphere. Dovetail connection Ø 8mm