1. Most electric screwdrivers are designed for professionals. When purchasing, we should distinguish between professional and General Electric Screwdrivers. Generally, there is a difference in power between professional and general household electric batch. The power of professional electric batch is large, so as to facilitate professionals to reduce the workload. Because the project of general household electric batch is small and the workload is relatively small, the input power of electric batch does not need to be very large.

2. The outer package of the electric batch shall have clear patterns without damage, the plastic box shall be firm, and the buckle for opening the plastic box shall be firm and durable.

3. The appearance of the electric batch shall be uniform, the surface of the plastic parts shall be free of obvious shadow wires and dents, scratches or collision marks, the assembly dislocation between shell parts shall be ≤ 0.5mm, the coating of aluminum castings shall be smooth and beautiful without defects, and the surface of the whole machine shall be free of oil and stains. When held by hand, the handle of the switch shall be flat. Generally, the length of cable shall not be less than 2m.

4. The nameplate parameters of the electric batch shall be consistent with those on the CCC certificate. The detailed address and contact information of the manufacturer and manufacturer shall be provided on the manual. The nameplate or certificate of conformity shall have the traceable batch number of the product.

5. Hold the electric screwdriver by hand, turn on the power supply, operate the switch frequently to make the tool start frequently, and observe whether the on-off function of the electric screwdriver switch is reliable. At the same time, observe whether there are abnormalities in the TV and fluorescent lamp on the scene. In order to confirm whether the electric screwdriver is equipped with an effective radio interference suppressor.

6. The electric driver shall be powered on and run for one minute. Hold it by hand during operation. The hand shall not feel any abnormal vibration. Observe the reversing spark. The reversing spark shall not exceed 3 / 2 level. Generally, there shall be no obvious arc on the surface of the commutator when looking inward from the air inlet of the electric driver. There shall be no abnormal noise during operation.