RC Throw Meter App allow you to build your own Bluetooth throw-meter for a very reasonable cost. It doesn't require any soldering or cabling. You just need to have access to a 3D printer and that is all!
The component is the BWT61CL/BWT901CL from Wit Motion, a 6 axis Bluetooth attitude angle sensor with battery incorporated.
It is based on the JY61 sensor, has Bluetooth or serial connectivity, integrates a dynamic Kalman filter algorithm, an internal voltage stabilising circuit module, voltage 3.3v~5v. The only drawback it has is that the Bluetooth BLE is only compatible with android. The battery has a 150mA capacity so last for a long operation time.