The United States and its territories usually use the Fahrenheit scale to measure temperature, whereas the majority of the world uses Celsius. For this reason, thermometer manufacturers make thermometers with the ability to use either scale. With the touch of a couple of buttons, owners of a Braun thermometer can set it to display temperature using whichever scale they prefer.
Press and hold down the memo button, which is labelled, "O/mem".
Press and release the activation while continuing to hold down the memo button. The thermometer will go into "change temperature scale" mode.
Press the activation again to toggle between Celsius and Fahrenheit. The screen will show a "C" for Celsius or "F" for Fahrenheit.
Release the memo button when you have chosen the temperature scale you prefer.