Precision Dual-Grade Control for Demanding Jobsites
The Bosch GRL4000-80CHK Revolve4000 is a professional-grade dual-slope rotary laser kit engineered for contractors who need accurate, repeatable grade control across complex site conditions. Whether you're cutting drainage channels, establishing foundation pads, or grading multi-directional slopes, the GRL4000-80CHK delivers the precision and reliability that keeps projects on schedule and within spec. This complete kit includes the GRL4000-80 laser unit, RC40 digital remote control receiver, LR40 laser receiver, BT400HD tripod, GR500 grade rod, and an 18V lithium-ion battery with charger — everything your crew needs to get to work immediately.
Overview & Jobsite Applications
The Revolve4000 system is built for high-productivity site work where a single-grade laser simply won't cut it. Dual-axis grade capability allows simultaneous slope setting in both the X and Y axes, eliminating the need to reposition the instrument for cross-slope applications. The RC40 remote control receiver lets operators adjust grade settings from up to 200 ft away, reducing crew requirements and minimizing instrument downtime. With a working range of up to 2,600 ft in diameter and a self-leveling range of ±5°, this system handles everything from small residential pads to large commercial grading contracts.
Key Specifications
- Model: GRL4000-80CHK
- Grade Range (X-Axis): -10% to +25%
- Grade Range (Y-Axis): ±10%
- Self-Leveling Range: ±5°
- Working Range: Up to 2,600 ft diameter (with receiver)
- Rotation Speed: 150, 300, 600 RPM
- Accuracy: ±1/16 in. at 100 ft
- Battery: 18V Lithium-Ion (included)
- Run Time: Up to 40 hours per charge
- IP Rating: IP66 dust and water resistant
- Remote Control Range: RC40 up to 200 ft
What's in the Kit
- GRL4000-80 dual grade rotary laser unit
- RC40 digital remote control receiver
- LR40 laser receiver with clamp
- BT400HD heavy-duty tripod
- GR500 13 ft telescoping grade rod
- 18V lithium-ion battery and charger
- Carrying case and user documentation
Job Applications
Site Grading & Earthwork: Set precise dual-axis grades for large pad preparation, parking lots, and commercial earthwork where cross-slopes and drainage pitches must be established simultaneously without moving the instrument.
Drainage & Stormwater Systems: Dial in exact fall percentages for swales, retention basins, and pipe trenches. The fine grade adjustment increments ensure proper water flow direction on every run.
Foundation & Flatwork: Establish level and sloped reference planes for concrete flatwork, footings, and slab pours where elevation consistency directly impacts structural performance and inspection results.
Road & Curb Grading: Maintain consistent cross-slopes and longitudinal grades across road subbase preparation and curb and gutter layout — ideal for municipal and DOT-spec paving projects.
Compatible Accessories
- Bosch LR40 Laser Receiver — extended-range rod-mounted receiver for bright conditions
- Bosch RC40 Remote Control — wireless grade adjustment up to 200 ft
- Bosch BT400HD Heavy-Duty Tripod — stable platform for outdoor laser work
- Bosch GR500 Grade Rod — 13 ft telescoping aluminum rod compatible with LR40
- Bosch 18V Replacement Battery — keep a spare on site for all-day operation
Related Guides
- How to Set Dual-Grade Slopes with a Rotary Laser
- Rotary Laser vs. Grade Laser: Choosing the Right Tool
- Site Grading Best Practices for Contractors
- Understanding Laser Receiver Range and Accuracy
Frequently Asked Questions
- Can the GRL4000-80CHK set grade in two directions at the same time?
- Yes. The Revolve4000 supports simultaneous dual-axis grade, allowing you to set independent slope percentages along the X and Y axes at the same time — critical for drainage work and complex site grading where cross-slopes are required.
- What receiver is included in the GRL4000-80CHK kit?
- The kit includes the LR40 laser receiver for rod-mounted grade work and the RC40 digital remote control, which doubles as a receiver and allows grade adjustments from up to 200 ft away from the instrument.
- Is the GRL4000-80CHK suitable for outdoor use in wet conditions?
- Yes. The GRL4000-80 laser unit carries an IP66 rating, meaning it is fully protected against dust ingress and powerful water jets — suitable for use in rain and dusty site environments common in grading and excavation work.
- What is the battery life on the GRL4000-80CHK?
- The included 18V lithium-ion battery provides up to 40 hours of continuous run time, making it practical for full-day and multi-day field use without frequent recharging interruptions.
