Guys, if you doubt your spirit level then turn it around and see if it agrees. Worst case scenario mark the glass to let you know the proper setting. Mind you the laser line is pretty much ubiquitous these days.
Want a video to see how shite they are? How can fluid dynamics be wrong? ;)
@Airhead started
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Guys, if you doubt your spirit level then turn it around and see if it agrees. Worst case scenario mark the glass to let you know the proper setting. Mind you the laser line is pretty much ubiquitous these days.