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  • That Kaiser one I linked to is 10.5mm according to the internet. I'm sure I had a cheaper one that was more like 6mm. But as you say, not exactly accurate.

  • It’s not for critical architecture, mostly to aid hip-level shooting so doesn’t need the accuracy of a surveyor’s tool.

  • Look for line levels. We used to use them when drawing cross sections in archaeological features. Hang of a taut string to make sure the string is level to give you something to measure from. They're usually pretty compact.

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