PROTO 3/8"" DRIVE RATCHETING HEAD MICROMETER TORQUE WRENCH 16-80 FT-LBS ASME 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.