The Wohler RF 220 Hygrotemp is a handheld, battery-powered instrument designed for the quick determination of the air humidity in housing spaces and workplaces. It can be applied to climate control systems, analyze structural damages, discover potential mold areas, and much more. The Wohler RF 220 Hygrotemp measures the actual air humidity and temperature and calculates the dew point and the wet bulb with these values.