Digital Indoor Temperature Humidity Meter Hygrometer TH801 Temperature Range: -58.0 to 158.0 F / -50.0 to 70.0 C, easy switch from Celsius to Fahrenheit Humidity Range: 10% to ~95% relative humidity RH - resolution 1% Memory: min/max for temperature and humidity Calendar, Alarm Clock and 12/24 hr mode Battery: 1x 1.5 Volt AAA (included!)