A fluorometer is an analytical instrument used to measure the fluorescence emitted by a sample when it is exposed to light. This device typically uses a specific wavelength of light to excite the molecules in the sample, causing them to emit light at a different wavelength. Fluorometers are commonly used in various fields, including environmental monitoring, biochemistry, and medical diagnostics. These instruments can detect and quantify substances such as chlorophyll, fluorescent dyes, and proteins. By analyzing the intensity of the emitted light, researchers can gain insights into the concentration and behavior of these substances in different environments or conditions.