Suzhou Changliu Purification Technology Co., Ltd. is a professional technology company integrating R&D, production and sales. The company's product CLJ-E laser dust particle counter has been widely used in clean room testing. On-site detection and leakage detection of filters; It can monitor the clean workbench, biosafety cabinet, HVAC system, computer room, beverage packaging environment, medical equipment production environment, hospital clean operating room and automobile spraying environment. It is an instrument for pharmaceutical production enterprises and their supervision and management departments to implement GMP standards and electronic production enterprises.