1. It should be selected according to the purpose. Use dry sandpaper for surface polishing of wood, bamboo, metal or other objects, and water-resistant sandpaper (water sandpaper) for metal or non-metal workpieces and surface polishing.​abrasive paper.  , Take a piece of noisy paper and shake it to see if there are too many particles, the less the better, the more the better.

2. Check whether the outer packaging of the product is damaged or opened, and whether there are indentations, cracks, or unevenness on the outer surface.

3. Observe the details of the product, check whether the edges and joints are evenly transitioned, do not scratch the hand, and whether the weight is sufficient.

4. For the same product, it is best for consumers to compare the material and inquire about the price in two or three merchants, so as to determine the range of the price of the product purchased, so that it is convenient for them to adjust the price.

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