The MaxiMet GMX-240 is a weather station that provides accurate meteorological information about wind and precipitation using an optical method. Three ultrasonic sensors measure wind speed and direction, and an electronic compass adds apparent wind measurement. It also provides average speed and direction, along with WMO averages and gust data. An integrated optical rain gauge senses water hitting its outside surface and provides measurements based on the size and number of drops. The optical rain gauge and the ultrasonic wind sensors have no moving parts, which helps avoid potential mechanical problems.