Stabila REC 160 RG Rotary Laser Receiver with Bracket 40 6240 The Johnson Two Sided Laser Detector hands free transport minimizing The Johnson Two Sided Laser Detector with Clamp enables construction professionals to use any red beam rotary laser outdoors or in high ambient light conditions when the beam is invisible to the human eye It comes with the RC 500 Remote Control that operates the TP L6's functions within a range of 600 feet and a grade range of 15% to 40% that makes elevation and grade matching easier Its visual display uses height difference symbols to indicate the laser alignment it is also equipped with an additional LED display at the back