PLS 180 Green Cross Line Laser Level PLS-60596 by Pacific Laser Systems Lazer Class-II;Laser Type-635nm,&lt;1mW Accuracy: +/- 1/8 inch @ 30 Feet (+/- 3mm @ 10 meters) Working Range: +/- 200 Feet (61 meters) w/ SLD Detector Operating Time: 2-6 Hrs