Environmental enclosures protect our dataloggers and peripherals from water and most pollutants. Currently Campbell Scientific has four standard enclosures: ENC 12/14, ENC 16/18, 6447, and 7414. The ENC 12/14 and ENC 16/18 include a 1.25" diameter conduit for cable entry and putty to seal it. The 6447 and 7414 include individual compression fittings that provide a more water-tight seal. This application note discusses the enclosure construction, mounting equipment inside of the enclosure, desiccant, and enclosure maintenance.