The FSC-IV planktonic microorganism sampler is a porous inhalation dust and bacteria sampler. It is designed based on the principle of particle impact and the theory of constant velocity sampling. Sampling is direct, and the wind speed at the sampling port is basically the same as that in the clean room, which can more accurately reflect the microbial concentration in the clean room. During sampling, the air carrying dust bacteria passes through the micropores at high speed and is impacted on the surface of the agar in the culture dish; These live microorganisms undergo dynamic rehydration during the cultivation process, growing at high speeds to obtain faster results.