This calibration device for torque wrenches converts any ratchet into a torque measuring tool. Use it to re-calibrate any type of torque wrench 1/2" drive UOM: Kg-CM, Kg-M, In-lb, Ft-lb, and N-m. This unit has an LED backlight, flip screen (180 degrees), 10 memory settings, and swivels 240 degrees. Contains (1) DC 3V, CR2032 battery and calibrating block. Range: 30-150ft-lbs. Specifications: Width: 4.9, Height: 7.2, Length: 2.3 Accuracy: 2%.