A colorimeter uses filters to record the amount of light reflected in 3 wavelength ranges across the visible spectrum. By virtue of its sensitivity to light, this device enables researchers to investigate the optical properties of substances. In physical and analytical chemistry, colorimetric analysis is a method of determining the concentration of colored compounds or ions in solution. It is applicable to organic compounds, inorganic compounds, and ions. The. A colorimeter might sound technical, but at its core, it's a simple and powerful device used to measure how much light a solution absorbs. By doing this, it helps figure out the concentration of a specific substance in that solution, all thanks to something called the Beer-Lambert law. It involves the quantitative.