Laser level, SORAKO. I use it every day to install kitchen cabinets. Works perfectly. I use it indoors, I don't think it can be used outside in bright sunlight. The vertical line is also very useful. Note that as you level, a green light will flash from the top to let you know the level is close enough to self-level. Red light means the level is too far from self-leveling level. Great little device. I make best use of this by attaching it to a camera tripod. That was my experience, you are the judge.
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