Tried-and-true levelling tips from pro carpenters

This tip won’t work for levelling house footings, but it’s great for approximating exterior grade changes as well as other long-distance levelling that doesn’t need to be exact, just close. Hold a level at eye height and centre the bubble. Sight along the top of the level to the point you want to check. The distance from your feet to the level is the height of the point you’re looking at.

Of course, the elevation you’re trying to measure won’t usually be the exact distance from your feet to the level, so you’ll have to do some math. You might be squatting, sitting down or standing. Whichever, figure out the distance from your eye to the ground and that’s the height to the point you’re sighting. In this case, we’re checking the elevation to the top of the fountain to help us size the pump.

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Source: RD.com