Use: Controlled screw tightening in the range of 0.5 - 4.5 N · m, Serial manufacture with constant tightening value, Electronic industry, precision mechanics and industrial manufacturing, Features: Pre-set torque screwdriver - without scale, With 1/4" female hexagon drive for use with 1/4" hexagon bits as per DIN 3126 - C 6.3, Classified according to DIN EN ISO 6789:2003 Type II Class F, with a traceable factory certificate., Calibrated to a permitted +/- 6 % deviation of the set torque, Precision radial ball clutch and cam design for controlled bi-directional tightening, Precision mechanism slips very noticeably when the pre-set value is achieved, Automatic resetting to the starting position, Fatigue-free working due to an ergonomic hand grip and a smoth tool reset action, Calibration stickers can be easily applied to the purpose designed nose, The pre-setting can be made at the factory or by the user on suitable torque testers, Automatic resetting to the starting position, Scope of delivery: Torque screwdriver Type PRO FH, Models 4.5 and 13.5 with additional removable T-bar for ease of use, Test certificate acc. to DIN EN ISO 6789, Delivery in sturdy cardboard packaging