Wiha 28502 TorqueVario-S Torque Screwdriver, 5-10 Inch Pound Tools marked with serial number and include calibration certificate Meets ASME B107.14m, EN ISO 6789, BS EN 26790 Enclosed mechanism ideal for production and controlled environments Reverse torque is 50% higher than indicated setting, easy removal Guaranteed accuracy to 5000 cycles or 1 year