This thermometer is designed to receive the infra-red rays emitted by the skinsurface and in the ear drum. It provides a fast and accurate means for you tocheck your baby’s temperature easily. If the thermometer is in the Stand-By Mode, press Button B to change toTemperature Measure Mode. The thermometer will briefly show all icons onthe display as per the image of “Fig. A”, and then thermometer will show 0.0˚C or 0.0˚F, this indicates the thermometer is ready for measuretemperatures. The measuring method (ear or forehead) follows the usage inthe last temperature measurement. Press and hold Button A will interchange the measuring method between earand forehead. Press and hold Button B will interchange the temperature unit between °Cand °F