Digital Temperature Humidity Meter HY303 Hygrometer Thermometer Temperature Range: -4.0 to 122.0 F / -20.0 to 50.0 C, easy switch Celsius to Fahrenheit Humidity Range: 10% to ~95% relative humidity - resolution 1% Memory: min/max for temperature and humidity Extra large Display, easy to read Battery: 1x 1.5 Volt AAA (included!)