Calibration should be verified annually by a certified facility. The wrench is accurate to ±4%.
To set desired torque, disengage the lock ring. Rotate the handle until the upper edge aligns with the vertical scale’s zero. Then, rotate the micrometer thimble to the required value. Leo grabbed a scrap piece of angle iron and a half-inch bolt. He set the wrench to 35 ft-lbs—a common spec for a wheel lug nut. He slipped a deep socket on the drive. Ka-chunk . He fit it over the nut and pulled. mastercraft 1 2-in drive torque wrench manual
When the preset torque is achieved, the wrench will emit an audible “click” and a noticeable break in the handle. Cease pulling immediately. Continuing to pull will damage the internal release mechanism. Calibration should be verified annually by a certified