Dual-scale thermometer measures wet- and dry-bulb temperature and dew point in F and C Capacitive humidity sensor ranges from 0 to 100 percent relative humidity (RH) Data hold for recording data, and minimum and maximum temperature readings Protective cover over sensor Power Consumption: <2.0mA Sensor: Electronic Capacitance Polymer Film Sensor Range Relative Humidity: 0 to 100% Range Temperature: -20 to 50°C (-4 to 122°F) Accuracy Relative Humidity: ±3%RH from 10 to 95%RH, +5%RH (0 to 10, 95 to 100%RH) @ 25°C (77°F) non-condensing