Apps.
I use an inclinometer app (Android and iPhone), and in comparison to me traditional analogue inclinometer, they are within a bee's dingle of each other.
If you can live with the ads too, they are free.
Just make sure you use the flat side of the phone without any power buttons, volume buttons etc. I also use it to level the mount, as nearly all the inclinomter apps flip to bubble level if held horizontal.
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