This 1/2" drive calibration device can be used as a torque wrench and/or a torque calibration tool. It converts any ratchet into a torque measuring tool, and it can also be used to re-calibrate any type of torque wrench. The torque range is 30-150ft-lbs, and the units of measurement are: Kg-CM, Kg-M, In-lb, Ft-lb, and N-m. The tool has a LED backlight, flip screen (180 degrees), 10 memory settings, and swivels 240 degrees. It also contains a calibrating block to verify accuracy.