The Starrett 655-3081J Dial Indicator features a hardened steel gear train and jewel bearings. Supplied with a lug-on-center back, anti-magnetic mechanism and its balanced, tapered hands are easy to follow. The unbreakable crystal face is non-reflecting and 2-3/4". Furnished with a continuous reading double dial. This model has a Range of 75 mm, 0.01 mm Graduations and a 0-100 Dial Reading with 1.0 mm Range one Revolution and .375" Stem diameter.