Panels should be uniform color, smooth surface, no dents, noise, no bubbles, stains, cracks, swelling, lack of gum, deformation, scratches, shrinkage and other defects. Metal parts without burrs, cracks, corrosion traces, rust and screw head damage and other adverse conditions.
You should also weigh the components when buying switch sockets. If the merchant chooses the thin copper piece, the feeling will be lighter. And a good switch socket selection of copper and terminal terminals will usually be relatively thick, relatively heavy weight. The copper piece is the key part of the switch socket, and also the key spot of the counterfeit inferior product. Consumers in the purchase should also note: Some non-performing manufacturers in the product add iron to increase the weight, we must be in the purchase to see.