Spectrometers are devices used to detect, measure and analyze specific wavelengths of electromagnetic radiation. Sensors vary in the number of spectral bands it can sense, the bandwidths of each band, and spatial resolution. A Spectrometer uses a spectroscope used for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer. Spectrographs are spectroscopes with a photographic or other recording device to capture an image of the entire spectrum, or portions thereof, at one instant in time. (Specific Spectrometers: Cloud Top Spectrometer, Fourier transform Spectrometer, Near-Infrared Spectrometer, Particle Spectrometers, UV Spectrometer, Visible Spectrometer, FTIR Spectrometer).