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How to Read a Spirit Level:
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You could use some solid construction that connects the subject and camera. That way you would be able to see it quite clearly. Also what would be really good is to use a technical camera. You can see better, and you can adjust the lens better than on a regular camera.
Set it on a horizontal surface and read the bubble. Flip it end for end and check it again. Then rotate it, check it, and flip it end for end again, checking again. All 4 readings should be the same. Then check the plumb vials in the same way against a column or wall.
The liquid is already in the level and they have a jar full of bubbles which they inject into the level.