Torsion Drive 60-600 ft-lb, 80-800 Nm torque wrench 3/4" male square drive +/- 1% indicated value accuracy from 10-100% full scale 4000 samples per second sampling rate for super fast break away torque measuring Non length dependent (accuracy is the same no matter where you push on the handle) Extremely durable and easy to use (very few plastic parts) 9 volt battery operation Large 1/2" digits with rotating bezel for easy viewing Made in USA NIST traceable certification supplied with each wrench Audible buzzer and three lights (yellow, red, green) for target torque setting Quick adjust target setting with selectable tolerance (1-10%)