Look at the spray paint on the surface of the cabinet. All the steel in a good cabinet needs to be painted, and it needs to be sprayed evenly. In this way, a good rust proof and dustproof can be achieved.
Look at the thickness of the steel plate, as long as you use your fingers to know the thickness of the steel plate, and the inside of the cabinet is also a good point, because sometimes the equipment is heavy, if it is too thin, you can't bear the weight of the equipment.
Look at the glass, sheet metal processing glass also a bit thicker, especially to see whether there is no cracks around the glass, if some, it is not necessary to suggest, but also to see whether glass is difficult.