1.  Don't buy the cheapest one you can buy.  Look for a rotating construction that is easy to use to use, accurate, can handle getting wet and can be serviced if needed.

2.  Always purchase an automatic leveling laser. For example a Leica Rugby 610 or a Rugby 810 laser. The manual lasers are a real hassle and will just end up getting you in trouble on your jobsite.  Auto leveling lasers are the only ones you should buy.

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