Clear nameplate: The nameplate of high -quality electric gourds is very clear. It is marked with manufacturers, tonnage, uplifting heights, and working levels, and can be clearly seen after many years. Slow motor heat: This can be tested on the spot. After a period of time, observe the fever. If the fever is good, it is a high -quality electric gourd. Looking at the paint: The texture of the paint can be seen intuitively. If the lacquer surface is not bad, it should not be too good than the internal quality. Look at the texture: The overall quality of the gourd is very delicate at first glance. The quality is generally good. If you look at it at a glance, the quality must be verified.