Mitutoyo 1670S Dial Indicator, #4-48 UNF Thread, 0.375" Stem Dia., Lug Back, White Dial, 0-40 Reading, 1.614" Dial Dia., 0-0.1" Range, 0.0005" Graduation, +/-0.0005" Accuracy

Unlike many other dial indicators, the one revolution dial indicator literally shows the entire spindle travel or range as one sweep of the hand, eliminating the possibility of reading errors due to miscounting the multiple revolutions. With one-revolution dial indicators, "within tolerance" and "out-of tolerance" can never misinterpreted An unique shock-proof mechanism is incorporated, providing improved immunity to shock due to sudden spindle retraction caused by high impact.