This app is the complement of the AT Wizard hardware. It connects via Bluethoot to your Android phone.
Usage is quite simple: place the sensor on the moving surface and power it on.
Launch the app and tap on "Disconnected" text shown on Status field.
Once connected, place the moving surface in neutral position.
Then enter the length of the chord and press "Zero".
Then you can start measuring throw and angle as surface moves on.