The USB4000 Spectrometer is distinguished by its enhanced electronics: 16-bit A/D resolution with auto nulling feature (an enhanced electrical dark-signal correction); EEPROM storage of calibration coefficients for simple spectrometer start-up; 8 programmable GPIO signals for controlling peripheral devices; and an electronic shutter for spectrometer integration times as fast as 3.8 milliseconds -- a handy feature to prevent detector saturation (for faster integration times using the External Hardware Trigger Mode.In addition, the USB4000 has signal-to-noise of 300:1 and optical resolution (FWHM) ranging from 0.3-10.0 nm (depending on your grating and entrance aperture selection).