SHIMPO DT-207LR

Accurate up to 0.006 +/- 1% Digit (6 RPM Max) (25,000 to 99,999 RPM), 1 RPM Resolution, Contact and Noncontact Tachometer 6.5945 Inch Long x 2.3622 Inch Wide x 1.811 Inch Meter Thick, 6 to 99,999 RPM Measurement