In the Stand-By Mode, the time display and the ambient temperature displayare shown on the LCD display screen alternately. The time display showsthe clock in hh:mm (24-hour) format. The ambient temperature displayshows the measured room temperature in temperature unit (°C or °F) that islast used in the Temperature Measure Mode. The time display and the ambient temperature display interchange every 20seconds. If the thermometer is in the Temperature Measure Mode, it willswitch back to Stand-By Mode after left idle for 30 seconds.