1. The vacuum filtering device has the advantages of mature technology convenient use and high efficiency. It contains a number of taps can realize a number of filtering process. The use of water circulation device to replace the oil circulation pump make it more convenient with low failure rate 2. The air blast drying device adopts German technology the air duct is advanced the fan noise is small the performance is stable; 3. Microcomputer High precision intelligent control. Once set the temperature it self judge the heating power and display heating state. 4. Adjustable air inlet for temperature control and gas emissions. 5. digital electronic balance has correction function self-checking function and multiple modes