The Vernier Colorimeter is designed to determine the concentration of a solution by analyzing its color intensity. The color of a solution may be inherent or derived by adding another reagent to it. The Colorimeter measures the amount of light transmitted through a sample at a user-selectable wavelength. Using the front panel arrow keys, you may choose from four wavelengths: 430 nm, 470 nm, 565 nm, and 635 nm. Features such as automatic sensor identification and one-step calibration make this sensor easy to use.