PROTO Ratchet Head Torque Wrench, 1/2in Drive, 16-80 ft lb - Calibrated to +/- 3% clockwise direction and +/- 6% counter clockwise at 20% to 100% of full scale. Calibration is accomplished by manual loading the torque wrenches. Manufactured to meet standard industrial torque applications, general industry, heavy equipment, and maintenance.
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