Fonix FP35 hearing aid test box

Can I change the way that the display looks?
Yes.
The usual display is a light background with dark lettering, however you can make a change in the main menu default settings to have a dark background with light lettering - details are in the user manual - you need to change 'Screen mode' in the first screen menu between dark - light, and then store menu to save the changed settings as shown below.

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