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Stabila are good (although their cheap ones are a bit shit).
Bmi are decent too. But if you’re not using them daily it probably doesn’t matter too much (although I’m reluctant to recommend shit levels).
I like these ones (although whoever decided to put “true pro” on them needs fired).
https://www.amazon.co.uk/Stabila-19598-True-Pro-Spirit-Level/dp/B089CWPKMG/ref=mp_s_a_1_3?dchild=1&keywords=stabila+level&qid=1604568006&sr=8-3The best bit is that the rubber feet on either end are proud on one side so that when you hold the level against the wall, it holds in place, which makes marking lines much easier.
Having an LED light built into the spirit bubble is also super handy, as is having a peep hole on the bottom so you can see the bubble when the level is straight in front of you. Both those add to the cost tho!
Edit: this one has the LEDs but not the peep holes. I also really like having a handle on them.
https://www.amazon.co.uk/Stabila-17393-196-2-Spirit-Level/dp/B001V9XDZ8/ref=mp_s_a_1_14?dchild=1&keywords=stabila+level&qid=1604568006&sr=8-14
Spirit levels ? Are they all of the same muchness. Lidl have a set of three going I was thinking to keep in the cupboard. I have a small 40cm Stanley* one already need something longer really
Edit: stabila not Stanley