Hey there, neighbors! The Ring app device health should certainly show you whether a resource is sufficient or not. For the Doorbell Pro, depending on mobile device type being used, the Device Health section should reflect a millivolts reading, as mentioned in this help center article.
To best confirm the power supplied from your transformer, we recommend checking the rating as labeled on the transformer, as this should reflect how much power is being delivered to your Video Doorbell Pro. Of course, this power can be impacted by wiring gauge, type, or length, and even the number of chime kits wired in or the age of the transformer used.
If your app is not reflecting a Device Health indication that your voltage is either sufficient or not, our support team can certainly take a closer look for you. Please give our support team a call at one of the numbers available here. We’re taking additional steps to protect our team and help reduce the spread of COVID-19, so this has resulted in longer than normal wait times. If you are outside of the US, please read our response to COVID-19 here to see how to contact support.