In addition to hash and E + H, wastewater treatment instrumentation and what other commonly used good brand?

I said I have seen the online instrumentation brand, in addition to what you mentioned and Germany, Germany, WTW, Japan, Shimadzu, Japan, DKK, Japan, HORIBA.

Below are some of the national environmental monitoring station has been certified by the testing center of the COD, ammonia nitrogen online monitoring instrument Guangzhou Yiwen, Beijing PU dialysis general, Shanghai Precision Instrument Factory. The following gives you some through the recognition of Beijing General Instrument Company Limited, Guangzhou Yiwen Technology Co. Delin Environmental Protection Instrument Co., Ltd, Jiangsu Green Leaf Environmental Protection Technology Instrument Co., Ltd, Lanzhou Lianhua Environmental Protection Technology Co. Ltd, Shimadzu (Hong Kong) Limited, Shengli Oilfield Longfa Industry and Trade Limited Liability Company, Shijiazhuang Gao De Environmental Science and Technology Company Limited, Jiangsu Jiangfen Electric Analysis Instrument Co.