GL-900 sewage quality analyzer, the principle of the measurement project conforms to the recognized methods of the environmental protection industry, equipped with imported light sources and sensors, and advanced optical structure design. It also supports two colorimetric methods: tube colorimetric and dish colorimetric. The tube colorimetric method adopts 360 ° C; The rotational colorimetric method can improve the stability of measurement data by 10 times, effectively solving the testing error caused by pipe wall scratches.