Amprobe TH-1 Compact Probe Style Relative Humidity Meter Relative humidity (RH), temperature, wet bulb, and dew point meter is used for HVAC, indoor air quality, and environmental applications 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: &lt;2.0mA Sensor: Electronic Capacitance Polymer Film Sensor Range Relative Humidity: 0 to 100% Range Temperature: -20 to 50C (-4 to 122F) Accuracy Relative Humidity: 3%RH from 10 to 95%RH, +5%RH (0 to 10, 95 to 100%RH) @ 25C (77F) non-condensing