Wacom Intuos Pro Manual page 43

Be sure you have selected the tablet unit you are testing from the Tablet Info column.
2. For a Touch Ring, slide your finger around the entire circumference of the Touch Ring and watch
the Left Touch number indicating your current finger position on the Touch Ring.
3. Press the Center Button to toggle between the four modes and note whether the corresponding
LEDs illuminate. If any of the functions are set to Skip, the corresponding LED will be skipped in the
toggle sequence.
4. When you are done, click on the Close button to exit the dialog.
If these tests fail, you may have defective hardware. See
Important: Some applications can override and control the ExpressKey or Touch Ring functions.
Consider closing any open applications except
For details, see Using integrated
Wacom Tablet Properties
applications.
Technical Support.
when testing the Touch Ring.