•Measures root tangent length of spur gears and helical gears.
•For measuring narrow grooves & other recessed features from 0.03" thick.
•Discs are .787" in diameter, 0.3" thick at the edge.
•Measuring discs are hardened , ground and micro-lapped for greater accuracy.
•Positive locking clamp with ratchet stop.
•Satin-chrome for easy reading.
•Supplied with fitted case