Colorimeter is an electronic device that measures the absorbance of specific wavelength of light with the help of a specific solution. Colorimeter is commonly used to determine the concentration of a solution in order to benchmark the quality of food item, printer and others. There are some essential parts of colorimeters such as filament lamp, colored filter, cuvette, photo resistor, output meter, and other. In colorimeter, low voltage filament is also used as light source and cuvette uses to hold the working solution. Moreover, a voltage regulator and light detector is used to control the fluctuation in the circuit and detector is used to detect the light path as well as to make comparison between working solution and pure solution which is used for colorimeter in order to enhance the accuracy of colorimeter. The output of colorimeter is shown by digital, analogue, linear scale, and logarithmic scale. Colorimeter is used commonly in food & beverage, textile, and printers to check the quality of product in research & laboratory. The beneficial rage of colorimeter is 0 to 2. However, the absorbance scale is try to set between 0-1 in each end-users owing to, above 1 the result become unreliable due to scattering of light.