Wastewater online monitor which brand is better

It seems that I answered you once, on the online instrumentation I have seen the 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 monitor Guangzhou Yiwen, Beijing PU dialysis of the general public, Shanghai Precision Instrument Factory. Here are some online COD and ammonia nitrogen monitors that have passed the certification of the testing centers of national environmental monitoring stations, such as Beijing Pudian 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.