Proto Inch Pound Ratchet Head Torque Wrenches, 3/8 in, 40 in lb-200 in lb (577-6064C) EachCalibrated 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. Tool Type: Torque Wrench Drive; Head Type: 3 4" Drive; Torque Rating: 40 in lbs to 200 in lbs;