Photometers are photometric measurement instruments that can be used to measure the concentration of organic and inorganic compounds in solution by determining the absorbance of specific wavelengths of light. Integral to water quality analysis, photometers go beyond simple testers by allowing users to develop a chemical profile of the sample rather than just simple detection of the presence of a chemical compound.

Photometers have many laboratory and practical applications. Besides being valuable for basic research in chemistry and biology laboratories, they are valuable tools for measuring water quality by determining the concentration of a wide range of substances and contaminants such as heavy metals, radionuclides, nitrates, phosphates, fluorides, pesticides, and many others. They can also be used to measure the concentrations of plant nutrient such as phosphorus, nitrate and ammonia in the soil.

Due to the special application scenarios and exposure to various substances, the instrument has relatively high requirements for its own materials. For example, the produce will  generally use membrane switches as the control panel, which is with better sealing and longer service life.