PLS Laser PLS-60534 PLS 90 Laser Level System, Yellow The PLS 90 from Pacific Laser Systems is an interior and exterior laser level, designed specifically for laying out 90 Degree angles No more 3 4 5, sagging string lines, or guesswork Use the PLS90 in bright sunlight or interior environments, square on slab or square on slope applications Working range of +/- 250-Feet Comes complete with carrying case, universal base, floor target, operating manual, 1 year warranty, SLD laser detector Laser Class-II; Laser Type-635nm, &lt;1mW