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Hello @GilBur61 ,
The option for 24-hour clock is not attached to your tracker (since you can have multiple per account); it's instead tied to the account.
You may change it on your online setting here.
I hope this helps.
Frank | Washington, USA
Fitbit One, Ionic, Charge 2, Alta HR, Blaze, Surge, Flex, Flex 2, Zip, Ultra, Flyer, Aria, Aria 2 - Windows 10, Windows Phone
Take a look at the Fitbit help site for further assistance and information.