PROTO Ratchet Head Torque Wrench, 3/8in Drive, 40-200 in lb - Calibrated to +/- 4% in both the clockwise and counter clockwise. Calibration is accomplished by manual loading the torque wrenches. Ratcheting mechanisms are performance tested to over 80,000 cycles at 1/3 ANSI proof loads for durability. Manufactured to meet standard industrial torque applications, general industry, heavy equipment, and maintenance.
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