Power tool is a motor or electromagnet as power, through the drive mechanism to drive the working head of the handheld or portable mechanized tools. Power tools are easy to carry, easy to operate, versatile and so on, can greatly reduce labor intensity, improve work efficiency, to achieve manual mechanization, which is widely used in military, aerospace, construction and decoration, auto maintenance, machinery, oil Petrochemical, power, rail transportation, bridges, gardening and other fields, and a large number of access to modern home life. Whether it is professional needs or home decoration DIY use, the time to buy power tools need to pay attention to the following points:

　　According to the need to distinguish between home or professional use, most of the power tools are designed for professionals in the purchase should be differentiated from professional and general household tools. Usually professional and general household tools with the difference in power, professional tools with a larger power to facilitate the work of professionals to reduce the general household tools as a smaller project, the workload is relatively small, so the tool input Power does not need to be great.

　　Tool packaging should be clear pattern, no damage, plastic box strong, open the plastic box of the hasp should be durable.

　　The appearance of the tool should be uniform color, plastic surface without significant filament and dent, there should be no scratches or bump marks, the shell assembly misalignment between the parts ≤ 0.5mm, aluminum castings smooth and beautiful without defects, the whole surface should No oil and stains. Hand grip, the switch handle should be flat. The length of the cable should not be less than 2 meters.

　　The nameplate parameters of the tool should be consistent with those of the CCC certificate. The manufacturer's and manufacturer's address and contact details should be included in the instructions. The nameplate or certificate shall have a lot number traceable to the product.

　　Hold the tool by hand, turn on the power, frequent operation of the switch, the tool frequently start to observe the tool switch off function is reliable. While observing the scene of the TV, fluorescent whether there is an anomaly. In order to confirm whether the tool is equipped with a valid radio interference suppressor.

　　Tools for running power for one minute, run-time hand-held, the hand should have no obvious feel any abnormal tremor, observe the change to the spark, the spark for not more than 3/2, generally from the tool inlet In the commutator surface should be no obvious arc. Operation, there should be no abnormal noise.