Handheld spectrometers are portable devices used to analyze the composition of materials by measuring the light they emit or absorb. These instruments work by shining a light on a sample and detecting the wavelengths of light that are reflected or transmitted. The data collected helps identify the chemical makeup of the sample, making handheld spectrometers useful in various fields, including chemistry, environmental science, and forensics. These devices are designed for ease of use, allowing users to conduct analyses in the field without the need for bulky laboratory equipment. Handheld spectrometers can be used to test substances like food, water, and pharmaceuticals, providing quick and accurate results that aid in quality control and safety assessments.