Multipurpose Laser Level Use this Multipurpose Laser Level for hanging pictures， installing shelving，laying flooring， hanging wallpaper and more. This tool combines a tape measure， a three-position bubble level and a laser level into one tool. The tape measure is an 8-foot measure that includes imperial and metric linear measures， with graduations down to 1/32" and 1mm. Features: Laser light has an on/off power switch. Laser max output: less than 0.5mW Note:Laser Ranging Error，that is given as "+/-2mm at 10m and 25m" Powered by 3*AG13 button cell battery (included)