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Why no instructions? If new, it should have instruction sheet. If you picked it up used, beware, the service life of clickers is limited -- re-calibration at commercial facilities is too expensive compared to replacement cost. Clickers are not as accurate as your beam anyway so DO truct your wrist/elbow if you suspect the wrench should have already clicked -- more hardware has been damaged with clickers than with calibrated wrists!
prs
prs