The SR50A-EE is an anodized version of Campbell Scientific's acoustic sensor for measuring the distance from the sensor to the snow surface. The sensor has been designed to operate in extreme environmental conditions where corrosion is a concern (such as coastal regions). The SR50A-EE features an aluminum body that has been treated with a Type III, hard-anodizing process (MIL-A-8625 Type III) that delivers best-in-class corrosion and wear resistance. To properly calculate snow depth from the measured distance, an air temperature measurement is required to correct for variations of the speed of sound in air. This sensor is compatible with most Campbell Scientific data loggers.