The design performance of this instrument meets the requirements of national environmental protection industry standards. At the same time, it combines traditional methods with advanced computer technology, applies microcomputer optoelectronic colorimetric detection principles to replace traditional methods, eliminates human errors, greatly improves measurement resolution, and achieves automation of the measurement process. It can be widely applied to the monitoring of sewage outlets of factories and mining enterprises, the monitoring of imports and exports of urban sewage treatment plants, the monitoring of water quality of Rivers and Lakes, and the process control of sewage treatment facilities. It can be widely applied to the detection of wastewater from various industries (industrial wastewater, urban sewage, domestic sewage, and surface water in rivers and lakes).