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The wavelength range (also called spectral range) is the range of wavelengths that each spectrometer can measure.  StellarNet offers spectrometer options that cover a 190-2500nm wavelength range. Wavelength range is based on the spectrometers grating’s ability to disperse onto the detector array. It is determined by the groove density of the grating and the physical size of the detector. Generally, a higher groove density means a smaller wavelength range for a constant detector and spectrograph size. StellarNet offers two main sizes for the crossed Czerny Turner spectrographs, standard (BLUE-Wave) and HR, which is 2x as big. Increasing the optical path of the spectrograph can allow for higher resolution configurations. Thus HR stands for High Resolution.  For NIR spectrometers the InGaAs PDA can come with 512 or 1024 pixels. The pixel size is not changed so the detector size doubles when upgrading to the 1024 pixel PDA. This leads to a broader wavelength range with roughly the same resolution. Examine the Standard Model tables for the spectrometers to see this for yourself.