*Four way measurements for outside, inside, depth and step measurements *Covered rack prevents particles from fouling teeth of rack *Hardened stainless steel *Measuring faces ground and micro-lapped for accuracy *Thumb roller movement of slider for a direct reading to 0.001" (0.05mm)- for the 150mm size (0.02mm) *Beam measures in metric and imperial *Bezel clamp and rotation for zeroing *Slider clamp for repetitive reading *Beam engraved with clear black lines *Complete in fitted carrying case *Weight: .75lbs