Apache BULLSEYE 5+ 360 Machine Control Sensor W/Rechargeable Battery Pack - 991376-02 
 
The versatile laser receiver that's ideal for both grading and excavating  
 
Grading Features: 
Blade tilt indication built in — helps the operator keep the blade level for increased production and accuracy.
Can be programmed to match an existing or known grade for slope matching operations.
Center On-grade provides an equal amount of grade information above and below on-grade.
Use on dozers, graders, scrapers, and box blades. Excavating
 
Features: Plumb indication built in — for quick and accurate grade checking.
Offset On-grade provides more information above grade utilizing the entire receiver for productive excavation.
 
Additional Features: 
3 selectable accuracies for each on-grade location.
Up to 6 channels of grade information plus directional out of beam indicators.
Upgrade to the TORNADO F1 automatic blade control with the same receiver.