Fujian Southern Pharmaceutical Co., Ltd. was established in September 2001, mainly engaged in anti-tumor drugs. In the production process, solvents with low melting point and good volatility are generally selected, including methanol, toluene, n-ethane and other solvents, which are easily volatilized during use, and long-term contact will cause benzene poisoning, seriously endangering human health. Alstad provides ASD5300C gas detector to detect toxic and harmful gases, providing protection for workers' health.