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A taught string and a line level will work fine.
https://www.screwfix.com/p/stabila-builders-line-level-3-80mm-/5494X
Put the level at one end of the string but not in the middle to prevent sagging.
stevo_com
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.