Rotary Laser Detector w/ClampMfr #: 40 6705 RED BEAM DETECTOR: This Johnson Laser Detector is ideal for using red beam rotary lasers outdoors; in high ambient light conditions or whenever the human eye cannot see the laser beam by quickly and accurately locating the laser signals. CLEAR DISPLAY: The laser visibility tool has a back lit LCD displays for easy reading and fine coarse detection settings; the detector displays the information you need to get your leveling job done