Level, like an Egyptian. This method is both cheap and very accurate. Note the use of windshield wiper fluid for color & anti-freeze.

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Zeno’s paradox?

 

Unfortunately I couldn’t come up with a way of doing right angles I trusted, so I ended up getting a laser level; which is a pretty awesome toy and confirmed how accurate liquid leveling was on top of giving me a perfect 90°.

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A perfect right angle if ever I’ve seen one.

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End of the day, with every mason strings finely adjusted to a perfect & level square. It doesn’t look like much but it took 7 hours to get there.

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Unlike the pricy electric laser level, the liquid one can sleep outside.

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