The torque tester of good helper is quite accurate, but it also seems to be produced by other manufacturers, and the price is still relatively expensive. The domestic performance-to-price ratio is still Shanghai Yongzhun brand and Changzhou Blu-ray brand. In addition, using the torque tester to calibrate the electric batch is a very general and accurate method, and the torque tester that matches the torque range of the electric batch should be selected.