Bi-directional accuracy of +/- 1% to 100% of capacity in Track and Peak modes meets or exceeds requirements of ASME B 107.300-2010 and ISO 6789. The Residual mode assists the user in determining retained Torque on a Joint. The accuracy percentage is contingent upon condition and user technique. Programmable Limits and a Yellow/Green/Red illumination system guide you as you use the Wrench. The display and a raised lens on the back of the Wrench illuminate when each significant Torque value is reached. Exacta® 2 comes with a serial cable for communication with a PC. Simple front panel programming. Four key switches on the front of the Exacta® 2 electronics module permit programming and operation of all key functions. 999 memory locations can be accessed, reviewed, uploaded and printed – all from the front keypad! Free Exawin software for programming Exacta® 2 from a PC. Four of six models have the Sturtevant Richmont Dovetail and can be used with Sturtevant Richmont Interchangeable Heads. The Exacta® 2 uses four (4) AA NiMH batteries of 2200 mAh capacity. Comes with free ISO/IEC 17025 calibration certificate.