Spectra Precision Lasers/Trimble LR50W Wireless Display Receiver, NiMH, RD20 Remote Display, Case and Charger Built-in blade tilt indicator helps the operators keep the blade level for increased accuracy and productivity Center On-grade provides an equal amount of grade information above and below on-grade. Use on dozers, graders, scrapers and box blades. Offset on-grade for productive excavation provides additional above grade information for less undercuts. Built-in plumb indicator for fast, accurate grade checking on excavators and backhoes. Six channels of grade information and directional out-of-beam indicators and three selectable accuracies for job tolerances from rough to finishing.