Press the button on the backside of your Meter once. The temperature unit will be switched between Fahrenheit and Celsius.
To change the temperature unit in the SwitchBot App, follow the instructions below:
Tap the hamburger icon on the left top to open the SwitchBot App menu.
Under the section of "Unit of Temperature", choose your preferred one.
Note: The temperature unit setting of the Meter display is independent of that setting of the App.