It is also very robust as it has an anodized aluminium body, cast aluminium base and well balanced stainless steel spoon. This rain gauge does exactly what the professional needs: measures rainfall to great accuracy with a well- balanced double tipping-bucket action. It requires very little maintenance. The Professional Rain Gauge is available with 0.1mm and 0.2mm resolution and has an orifice size of 200cm?. Long term accuracy is easily achieved with the Professional Model which requires hardly any calibration. A sealed reed switch, capable of indefinite operation, and its solid mechanics ensure that this instrument has an extremely long working life with little need for maintenance and adjustment. A spring mounted on the base of the funnel ?prevents bird droppings from clogging the inlet and a sharp edged ring around the orifice deters birds from landing on it. A heated version is also available for? year round measurements in cold climates.