The EPP2000 portable spectrometers are rugged. They don't require an expensive A2D card. Up to 8 units can be attached on a single cable in any combination of optical configurations.
All units can request scans at the same time.
Each unit has its own A2D and 2050 wavelength scan memory. This reduces the risk of alignment problems caused by vibration in shipping or field portable operations and eliminates thermal instability for the detector mount. There are less parts that can move and less parts that could fail. The concave grating is holographic which reduces stray light, and is aberration corrected providing the best possible spectra. The system resolution is 0.7nm across its range from 200-850nm.