Bubble level to your phone?

"Gunnertrones"Anyone tried this? I find it very handy making adjustments in the field.
Bubble Level (Spirit Level) - Angle & slope measure tool (carpenter tools set) av Tue Nguyen Minhhttps://appsto.re/no/hMU1K.i

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Neat. I used to use the bubble level in the iPhone (in the compass)
Found that to be more accurate since its digital. But that didn't have the slope indicator which this one does. This is cool. Thanks for sharing.