Digital Torque Adapter Accuracy : ±2% Memory : 50 Display Resolution : 0.1 N·m / ft·lb ,0.01 kgf·m Operation Mode : Peak/Trace Unit Selection : kgf·m, ft·lb, N·m Battery : AA x 2 PC.(Battery not included) Battery Life : 110hrs (continuous operation) Operating Ambient Temperature : -10ºC - 60ºC (13.9ºF -139.9ºF) Storage Temperature : -20ºC - 70ºC (-4ºF - 157.9ºF) Operating Relative Humidity : 15 to 90% noncondensing Switch off Automatically: 70 seconds (if do not use electronic torque adapter.) LED indicator : Green. Red Overload Alarm : 1,250 N·m (922 ft.lb.) Calibration must be done regularly to ensure accuracy. Suggested calibration period is at least every 12 months or 5000 times of usage