This 1" dial indicator has one revolution of 0.100", indicated by the revolution counter. The resolution is 0.001". there is a mounting Lug on the back of the case. Features: easy to read 2-1/4 inch white face with black markings crisp graduations durable satin chrome finish spindle rack pinions and gear trains are made of high-quality steel components ensuring long life built to AGD specifications vertical Lug back configuration graduations: Reach even farther with optional extensions Knurled thumb screws give a positive grip. Features magnetic base, upright post swivel, upright post, swivel snug, gauge rod, and indicator clamp.