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The HydroRad is a highly sophisticated environmental radiometer for rugged, in-the-field irradiance and radiance measurements from 350-850 nm. The system receives light from a sturdy and radiometrically calibrated light collector system for both in-air and in-water measurements. Originally designed for oceanographic applications, the HydroRad has a hard, anodized aluminum housing for use in harsh environments. It can withstand 300-meter water depths and comes with an accurate depth sensor. (Underwater use requires deployment cable.)

Inside the ruggedized housing is an S2000 Spectrometer, a light collector system, a micro-controller and data logger, and an internal rechargeable battery pack providing up to 20 hours of operation.