Patent ID: 7748126

Claim:
A laser level, comprising: a foundation ( 1 ) with at least one battery provided therein, a base ( 2 ) with at least one laser projection module ( 3 ) mounted thereon, wherein said base ( 2 ) and said foundation ( 1 ) are connected in a way that allows for 360 degrees rotation of said base relative to said foundation, and wherein one side of said foundation ( 1 ) that faces said base ( 2 ) is provided with anode and cathode conduction rings ( 11 ) that are connected to said battery, and wherein one side of said base ( 2 ) that faces said foundation ( 1 ) is provided with two contact pieces ( 21 ) that connect to said at least one laser projection module ( 3 ) and that connect to the anode and cathode conduction rings ( 11 ) to provide a conduction-wire-free connection between said laser projection modules ( 3 ) and said batteries; and said laser level further including a columnar cavity in the middle of both said foundation ( 1 ) and said base ( 2 ), wherein an upper-end shell ( 22 ) of said cavity for said base ( 2 ) and a lower-end shell ( 12 ) of said cavity for said foundation ( 1 ) are both made of transparent materials.