This mobile application allows you to build your own Bluetooth Throwmeter 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 app is available on playstore. Alternatively you can install the APK by your own. See releases folder for a proper APK file.
The app displays a description and instructions on the first screen, just install it. See also Planet Soaring Blogspot and search in blogs for 'rc throwmeter'.
This is an example of the throwmeter display screen.
Datasheets and manuals for the sensors you can find on the manufacturer websites. Otherwise, find the datatsheets here.
WitMotion BWT61CL
WitMotion BWT901CL
You can print your own universal mounting clip.
All parts and more are published on Thingiverse (Part 6479899)
Use this ideas to make your own incidence angle gauge.