Mitutoyo 2776S Dial Indicator, #4-48 UNF Thread, 3/8" Stem Dia., Lug Back, White Dial, 0-50 Reading, 57mm Dial Dia., 0-1" Range, 0.0005" Graduations, +/-0.002" Accuracy Standard dial indicator measures 0 to 1.0", with 0.0005" graduations, + or - 0.002" accuracy, and 0.05" range per revolution, for measuring surface variations Dial has a white face with contrasting hand, units displayed in inches, and a rotating bezel and limit markers Stem design provides long clamping range, no through screw-hole on the frame for dust- and water-resistance, and a lug back for mounting from the rear of the indicator Stem is 3/8" diameter with a #4-48 UNF contact point thread mount Continuous dial type with a reading of 0-50, for direct readings