If you are into vibration, then you need the free Mobius iVibe app. Yes, it is now free! Yes, it is really cool!
Think of iVibe as a wall chart in your pocket. Except it’s much better than a wall chart. Much, much better. You can follow a diagnostic tree, see the spectral patterns, learn about the fault, learn how to diagnose it. It really is very helpful.
If you visit Google Play or the Apple app store and search on “Mobius iVibe” you will find it and you can download it free.