The measuring cylinder is used to refill or empty the Class A Evaporation Pan to the set level required. Each 0.2 mm of water level on the evaporation pan represent 19.8 mm on the measuring cylinder. The Class A Evaporation Pan is a standard device for manual measurement of evaporation. These Pans are frequently used within networks in order to obtain information about evaporation on a routine basis, e.g. in applications in meteorology, irrigation, hydrology or water resources management.