An electric tool is a hand-held or movable mechanized tool that is powered by an electric motor or an electromagnet and drives the working head through a transmission mechanism. Electric tools have the characteristics of easy portability, simple operation, and various functions, which can greatly reduce labor intensity, improve work efficiency, and realize the mechanization of manual operation. Therefore, they are widely used in construction, housing decoration, automobiles, machinery, electricity, bridges, gardening and other fields. , and enters the home in large numbers.

　　Electric tools are characterized by light structure, small size, light weight, small vibration, low noise, flexible operation, easy control and operation, easy to carry and use, strong and durable. Compared with manual tools, it can increase labor productivity several times to dozens of times; it is more efficient, lower cost and easier to control than pneumatic tools.

　　The following points should be paid attention to when purchasing electric tools.

　　1. Distinguish between household use and professional use according to needs. Most power tools are designed for professionals. When purchasing, you should distinguish between professional and general household use tools. Generally, the difference between professional and general household tools is in power. Professional tools have higher power to facilitate professionals to reduce the workload. General household tools have relatively small workload due to small projects, so the input of tools Power doesn't need to be huge either.

　　2. The outer package of the tool should have a clear pattern and no damage. The plastic box should be strong, and the buckle to open the plastic box should be firm and durable.

　　3. The appearance of the tool should be uniform in color. There should be no obvious shadows and dents on the surface of the plastic parts, and there should be no scratches or bump marks. The assembly misalignment between the shell parts should be ≤0.5mm. The coating of the aluminum castings should be smooth and beautiful without defects. The surface should be free of oil and stains. The handle of the switch should be flat when held by hand. The length of the cable should generally not be less than 2 meters.

　　4. The nameplate parameters of the tool should be consistent with those on the CCC certificate. The detailed address and contact information of the manufacturer and production plant should be listed on the instruction manual. The traceable batch number of the product should be on the nameplate or certificate of conformity.

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

　　6. Power on the tool and run it for one minute. Hold it with your hand during operation. You should not feel any abnormal vibration in your hand. Observe the reversing sparks. The reversing sparks should not exceed 3/2 level. Looking inside, there should be no obvious arc on the surface of the commutator. During operation, there should be no abnormal noise.