Buttons: CLEAR: Press to clear the MAX/MIN readings. MAX/MIN: Press to display max/min readings. °C/°F : Press to change between Celsius and Fahrenheit Specs: Measuring Range: 0°F to 50°F (32°C to 122°C); 10% to 99% RH Temperature accuracy: ±2 ℉ Humidity accuracy: ± 5% RH Minimum and Maximum memory of both temperature and humidity