ZT-III desktop vacuum minipump is designed for chemical testing, clinical testing, bio-engineering, metallurgy, environmental protection. This vacuum decompressing device can draw and discharge liquid as well as decompression. It is widely applied to extract supernate or sediment after centrifugation in extraction & preparation of monoclonal antibodies ,clearing or exchanging liquid after integration, washing porous plastic plate for enzyme-linked immunosorbent, leaching experiment-like points of hybridization, rapid extraction in the sub-photometer ( device with pool) or a variety of biochemical-analytic instruments, replacing the current impact of the glass vacuum pumps. A multifunctional instrument, with reasonable mechanism, low noise and easy to carry, greatly facilitates the work of the laboratory.