The photoresistor concentration meter is used to detect the light energy passing through a substance, so as to understand the composition or properties of the substance. The milliammeter is divided into concentration grids according to relevant standards, so that the concentration value can be easily read. First, the light transmittance of the standard solution must be measured, so that the concentration of the solution to be tested can be known. When VL is not lit and there is no light source irradiating the photoresistors RG1 and RG2, adjust the potentiometer RP so that the milliammeter indicates 0, and the zero calibration is completed. At this time, turn on the power supply of the light-emitting diode VI, and through the irradiation of the standard solution and the solution to be tested by this light source, the concentration of the solution to be tested can be indicated on the milliammeter. Photoresistor concentration meter circuit:
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