Precise dial graduations of 0.001", with one revolution equivalent to 0.100" * Thumb-operated fine adjustment roll allows for one-hand use * Lock screw holds the sliding jaw in position, to ensure a consistent measurement * Rack teeth point down to keep foreign matter from clogging the gear, to help prevent measurement error * Hardened stainless steel bar, measuring surfaces, rack, gears, and depth rod for accuracy and long life * The Starrett 1202 Dial Calipers feature sharp clear graduations of .001-Inch with .100 per revolution * Sharp black graduations on the satin finished bar * Hardened stainless steel bar, measuring surfaces, rack, gears and depth rod * Knife-edge contacts, thumb-operated fine adjustment roll, adjustable bezel and lock screws for sliding jaw and dial bezel * Positive, spring-loaded double oinion anti-backlash control