The H-2727D measures both temperature and % Relative Humidity. It features Min/Max memory and switchable °F/°C. Temperature range is: 14° to 140°F / -10° to 60°C at ±2°F / ±1°C accuracy and 0.1°F/C resolution. Measures 10 to 99% relative humidity at a resolution of 1.0% RH. Includes Min/Max memory capability. Uses (1) AAA battery.