Change between Celsius and Fahrenheit display in the the OOLER app by going to Settings > "App Unit Preference".
Change the Celsius and Fahrenheit settings on the Control Unit by navigating to the gear on the top right of the Device's page and then toggle the 'Device Unit Preference' which will switch between Celsius and Fahrenheit for the display on the Control Unit.
Alternatively, on the Control Unit, you can hold the ‘+’ and ‘-’ buttons down for 5 seconds on the physical Control Unit to toggle between Fahrenheit and Celsius.
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