Overview for Topcon 1021200-73 RL-H5B Horizontal Self-Leveling Rotary LaserThe Topcon RL-H5B Horizontal Self-Leveling Rotary Laser is an accurate construction laser that is perfect for excavating, grading, and other general construction applications. When paired with the LS-80L laser receiver, this rotary laser offers Topcon 1021200-73 RL-H5B Horizontal Self-Leveling Rotary Laser