Regardless of what you use the level for, 2.7 degree matters a lot! I can detect something being off by 45 degree using my bare eyes. It's values like 2.7 degre

Regardless of what you use the level for, 2.7 degree matters a lot! I can detect something being off by 45 degree using my bare eyes. It's values like 2.7 degree which require to use a level. 2.7 degree off means that if you hang a one feet width shelf on your wall, one edge will be 0.72" higher/lower than the other. Would that matter to you?