"The Johnson Level Hot Shot Laser Mouse adheres to any surface for handsfree use and can project a laser line up to 30 feet. Features built-in horizontal and vertical leveling vials. Dimensions L x W x H in. 4 5/16 x 2 1/2 x 1 3/4, Interior Range ft. Up to 30, Laser Wavelength 635nm 10nm, Accuracy 1/2 in. at 20 ft. 2mm at 1m, Mount Type Superstick adhesive system, Battery Type AA, Beam Type Line, Battery Included Yes, Laser Output Adheres to any surface Handsfree use Integrated horizontal and vertical leveling vials"
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