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A water level .
You only really need one end to measure with - I just chucked the other into a bottle of water, which was used as the datum.
Currently digging down in to my garden in preparation to build a deck. Is there something I can use to check my levels against the house on the other side of a 5m patio?
The garden's about 12m long so I feel like a level and string isn't going to cut it for accuracy.