If you are just someone at home who needs to put up their TV, some paintings, maybe hand their wall clock or anything else, you might be able to get away with just a manual leveler. Unless, of course if you are a sucker for accuracy and you cannot deal with things that are not hanging levelled. However, if you happen to be someone who is in the construction business or manufacturing any products and need to make sure that the products you produce are perfectly levelled in all directions or the building you construct does not turn into the leaning tower of Pisa, then you will definitely need a self-leveling laser.
How Do They Work?
It is possible that you are someone who cannot live with uneven stuff in his or her house. In that case, if you are interested to know the mechanism behind a self-leveling laser, then you will find this article interesting. Their mechanism is relatively simple, actually. All it does is use another leveling device that is built in within itself. A pendulum will rock from side to side, until it is aligned with the Earth’s gravity and the magnet within the device. After that, the device will level itself and the beams projected will be of perfect level.
I would say that the biggest advantage would be that there is much less time spent on just leveling the surface; it does it on its own. This way, you get to be more efficient in whatever work you are doing.
Another, the most obvious, advantage is that its accuracy is as high as it gets!
If you are interested in high quality with more features, Bosch tools produce these self-leveling cross-line lasers with plumb points!