A versatile and unique gauge, no more converting RPM requirements or measurements to surface feet per minute speeds. Press the measuring wheel lightly against the moving surface for a quick surface feet per minute readout. Ideal for use with lathe set-ups.

Specifications:
Overall dimensions.........................................6 3/4 inches in length and 2 3/4 inches in diameter
Gauge...........................................................Reads in either direction--inner dial (counter-clockwise), outer dial (clockwise).
Range...........................................................0 to 600 surface per minute.
Accuracy.......................................................+/- 1% full scale