When I was positioning some wood in the shed on which to mount the pond UV unit, I used a long spirit level; however, is struck me that it makes no difference whether you use a long or short one, as the bubble chamber on each spirit level is exactly the same size.
For the longer level to be more accurate, it would be necessary for the bubble chamber to be much longer.
The difference in length between spirit levels is not about the bubble chamber itself but rather the area over which it averages the level measurement, the practical application of the tool, and the level of precision required for different jobs. For something that's perfectly straight and you merely want to mount it horizontal to the ground, both are equally accurate, but if you have a long, irregular length, such as a row of bricks, then the longer level evens out the small irregularities.
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