In the permanent section about professional devices, RSE "Kazhydromet" will tell you about the Photometer today.

Photometers are widely used in laboratory practice and are one of the most common and popular methods of chemical analysis.Almost half of all available methods are implemented on the photometer.
The photoelectric photometer is designed for measuring the transmission coefficients and optical density of transparent liquid solutions, as well as for measuring the rate of change in the optical density of a substance, determining the concentration of a substance in solutions and their salt composition.
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