||High resolution, fibre optic spectrometer used for marine chemical analysis to determine spectral information of water samples. It operates in the ultraviolet (UV), visible (VIS), and Near Infrared (NIR) spectral ranges (200 - 1100 nm). Ideal for spectroscopy and atomic emission spectroscopy, the AvaSpec-3648 outputs reflection, transmission, irradiance, and light emission and absorbance. It is based on a symmetrical Czerny-Turner with 75 mm focal length and 3648 pixel CCD linear array detector. The instrument has 16 grating options, an electronic shutter, Avantes deep-UV (DUV) coating, a range of slit sizes, and fibre optic entrance connectors. Optional additions include ultra-low stray light (ULS) optical bench, dual and multi-channel housings, wireless communication, and installed SD card. The instrument has an integration time of 10 microseconds, and a resolution between 0.04 and 20 nm.