About products Economical preset torque screwdriver is used to tighten workpiece with thread with torque requirements. This product works counterclockwise, can preset torque value. During the idle screwdriver set value, the priority is to control the thread fixing. It is suitable for locking screws of precision instruments, fixing circuit boards, etc. , which have higher requirements for screw locking and higher requirements for locking precision. Widely used in various industries of electrical, light, machinery manufacturing, research structure scientific and other industries. Features 1. can preset torque value and have sound alarm. When the tightening torque of the fastener reaches the preset torque value, it can automatically send out a click sound signal, accompanied by an obvious hand vibration, indicating that the work is finished. After the force is released, the affected parts are reset automatically. 2. Automatically switch reverse, both sides for simple and convenient operation. 3. use a straight line scale plus a secondary scale, the scale line reading is clear and accurate. 4. The jacket is made of nylon, strong and wear-resistant. 5. This torque screwdriver to implement GB/T 15729-- relevant provisions of 2008.