H meter, conductivity factor, hardness tester, turbidity meter, there is a need for test methods, not simply the instrument can be measured, such as the total hardness curative determination of calcium and magnesium ions (EDTA or flame atomic absorption method), E. coli colony determination, atomic fluorescence method to measure heavy metals such as chromium and lead. Water quality testing commonly used instruments and equipment are gas chromatograph, gas chromatography, liquid chromatography, spectrophotometry, atomic absorption, acid meter, turbidity meter, mercury meter, ray meter, analytical balance, conductivity meter and so on. If you are applying for metrological certification qualification, you must reach the level of 106 items of testing, the specific determination method, please refer to the "Standard Test Methods for Drinking Water".