1. The accuracy is +/-1%; 2. It is durable and convenient. ZHUNDA HNJ series of torque wrench tester are the special-used equipment to examine the torque screw driver and the torque wrench tester. 1.It uses the microprocessor technology and other series of new technologies, such as the digital filter, calibrating zero automatically, none-linear compensation etc. 2.The product has many features, ...