How to find a single AirPod?
If you are looking for a single AirPod, put the other one in the AirPod case and close it. Then start scanning again.
How to find the AirPod case?
You can't because the AirPod case itself doesn't send a signal.
Why can't I see my device?
Sometimes not all devices are visible in the app, because they are turned off, too far away or just not sending a signal
Why are the numbers unstable?
The displayed percentage is not stable because of the connection type and possible obstacles between you and your device.