The ZOLEO App bases your temperature units on your mobile device's settings and here are instructions to change these for Android Devices and iOS Devices.
Android Devices - Language Settings
If you're running an Android device, refer to this article from Google Support on how to change the language settings for your device. Refer to the section Change the language on your Android device on that page for how to set.
- When this language is set to "US" English, it will use Fahrenheit. Selecting CAN, AUS, NZ, or UK English should set it to Celsius.
iOS Devices - Temperature Units
Check your Temperature Unit choice under Settings > General > Language and Region. An option for unit selection (F or C) will be found on this page.