Heavy Duty Adjustable Torque Wrench (Newton Meter) Single scale - Newton Meter (N·m) Design for easy torque adjustment Quality accords to DIN ISO 6789:2017 & ASME B107.300-2010 Tolerance of torque ±3%(CW) CW/CCW Direction Calibration must be done regularly to ensure accuracy. Suggested calibration period is at least every 12 months or 5000 times of usage