After the "New Crown" epidemic, all provinces of PRC. are seriously carrying out supervision and inspection of drinking water during the epidemic to ensure the safety of drinking water quality. Drinking water safety concerns everyone's vital interests. It is a system project from the source of water supply, to the waterworks, to the distribution network, and to the user's faucet. Every link is connected and affects each other. The water quality analyzer instruments independently developed and manufactured by PROBEST can be widely used in the water supply industry.