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How do I change a Rexall Thermometer Model 77-330 from C to F?

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Press and hold down on/off button for 5 sec you will see c change to f or vis versa....manual reads the following...Setting the operating scale °F or °C The device setting is by default Fahrenheit (°F). To change the scale to °C, or back to °F:   1. Press and hold the ON/OFF button for 5 seconds - on the screen you will see the hourglass icon blinking and the last measured temperature.   2. Once the last reading showed on the screen disappears, the scale icon (0F, 0C) changes as well. 3. Release the button, the hourglass icon will disappear in 5 seconds and 2 beep sounds are heard, indicating that the device is ready for use.