Apogee Instruments' ultraviolet (UV) sensor provides a cost effective measurement of UV radiation. The patented domed shaped sensor head facilitates runoff of dew and rain, helping to keep the detector clean and minimizing errors caused by dust blocking the radiation path. Sensors are housed in a rugged anodized aluminum body and electronics are fully potted. Sensitive from 250 to 400 nm, spanning the solar UV range and UV output range of electric lamps.