When you open an issue for a change/improvement/feature request:

• A description of the problem you're trying to solve, including why you think this is a problem
• If the feature changes current behavior, reasons why your solution is better
• (optional) Possible solution/fix/workaround

As the screenshot shows, the font size of this UI is too small to read easily on screen.

As my screen is a common-modeled one with normal PPI (96), that too small font size of the measure tool UI is very hard to read.

It will be very nice if there is a way to set that a bigger font size.

Thanks for the creation to the world!