The GM-60 handheld water biological toxicity tester uses the luminescent bacteria method and complies with (ISO-11348-3) European Union standards. The luminescent bacteria used emit blue-green fluorescence of 450-490nm. during normal metabolism, and when it encounters external toxic substances , It will affect the metabolism of light-emitting bacteria, and then inhibit the intensity of light emission. The inhibition of light-emitting bacteria is related to the toxicity of external toxic substances. This method provides a basis for the detection and evaluation of environmental quality from a biological perspective. The detector can quickly detect water pollution on the spot, and it is an effective supplement to conventional physical and chemical scientific instruments. The detector uses dual light path control detection technology, which can perform dynamic detection of the entire toxicity inhibition situation during the detection process, clearly understand the process of toxic contact reaction, simple and simple the measurement results evaluate the lack of toxicity.