Though a self-leveling laser level is more accurate than the manual leveling laser level, that does not make a manual level useless or inaccurate. The issue here is that you have to adjust a manual level with your hands if it shifts beyond the angle at which you are measuring. On the other hand, a self-leveling laser level will automatically level up when it tilts below angle 4-degrees or more in some cases, hence you don’t have to worry about errors that can be created from such shifts. The best laser level for electricians, plumbers, and builders, for instance, is the self-leveling laser levels but you can rely on manual laser levels for most home DIY leveling.Read more: