Bosch GRL4000-80CH Revolve4000: Professional Dual-Slope Grading, Now Connected
The Bosch GRL4000-80CH Revolve4000 is a professional-grade connected rotary laser level built for contractors who demand precision across large, complex grading sites. Combining Bluetooth connectivity with independent X/Y dual-slope capability, the GRL4000-80CH lets crews dial in simultaneous grade adjustments from up to 330 feet away using the free Bosch Leveling Remote App. Whether you're grading a commercial pad, setting drainage slopes, or laying out a foundation, this complete kit delivers the range, accuracy, and jobsite durability professionals expect from Bosch.
Overview & Jobsite Applications
Designed for general contractors, site graders, civil crews, and concrete formers, the GRL4000-80CH thrives on large outdoor jobsites where elevation control is critical. The self-leveling system compensates automatically within its leveling range, while the dual-slope mode gives operators independent control over both axes simultaneously — a capability that dramatically speeds up complex drainage and pad grading work. Paired with the included LR40 receiver, the laser punches through bright daylight conditions across a working radius of up to 2,600 feet.
Key Specifications
- Working Radius: Up to 2,600 ft (800 m) with receiver
- Accuracy: ±1/16 in. at 100 ft (±1.5 mm at 30 m)
- Grade Range: ±10% on X-axis; ±10% on Y-axis (dual slope, independent axes)
- Self-Leveling Range: ±5°
- Rotation Speed: 300, 600, or 1,200 RPM selectable
- Connectivity: Bluetooth via free Bosch Leveling Remote App (iOS & Android)
- Remote Control Range: Up to 330 ft (100 m) via app or RC40 remote
- Power Source: Bosch 18V CORE18V battery (included) or AC adapter
- Battery Runtime: Up to 30 hours on single charge
- Protection Rating: IP67 — fully dust-tight and waterproof to 1 meter
- Operating Temperature: -4°F to 131°F (-20°C to 55°C)
What's in the Kit
- GRL4000-80CH Revolve4000 Rotary Laser Unit
- LR40 Laser Receiver with mounting bracket and clamp
- RC40 Remote Control
- Bosch GBA18V40 18V 4.0 Ah CORE18V Battery
- Bosch GAL18V-40 18V Battery Charger
- Carrying / Storage Case
- Target card and documentation
Job Application Use Cases
Site Grading & Drainage Slopes: Set independent X and Y grades simultaneously to establish precise drainage planes on commercial lots, parking areas, and athletic fields without repositioning the instrument.
Concrete Flatwork & Slab Forming: Use the high-accuracy beam and RC40 remote to control grade rod and screed elevations across large concrete pours, keeping crews on grade without constant instrument checks.
Foundation & Footing Layout: The automatic self-leveling and long working radius make the GRL4000-80CH ideal for establishing consistent elevation benchmarks across foundation excavations and footing forms.
Utility & Pipeline Grades: Dial in consistent single-axis slopes for trenching, storm drainage, and utility installation work where maintaining a precise fall-per-foot is critical over long runs.
Compatible Accessories
- Bosch BT 150 Elevating Tripod — Adjustable tripod compatible with GRL4000-80CH for freestanding setups
- Bosch GR 500 Grade Rod — 5-meter telescoping grade rod for use with LR40 receiver
- Bosch LR40 Replacement Receiver — Backup or additional receiver for multi-crew operations
- Bosch RC40 Remote Control — Standalone replacement remote for grade and rotation adjustments
- Bosch GBA18V80 18V 8.0 Ah CORE18V Battery — Extended-runtime battery for all-day operation
Related Guides
- How to Set Dual Slope with the Bosch GRL4000-80CH
- Rotary Laser Level Buying Guide for Contractors
- Using the Bosch Leveling Remote App on the Jobsite
- GRL4000-80CH vs. GRL800-20HVK: Which Bosch Laser Is Right for You?
Frequently Asked Questions
- Does the GRL4000-80CH work with the Bosch 18V battery system I already own?
- Yes. The GRL4000-80CH is powered by Bosch 18V CORE18V batteries, making it fully compatible with the broader Bosch 18V cordless tool ecosystem. The kit includes a GBA18V40 4.0 Ah battery and charger, but any Bosch 18V CORE18V or standard 18V battery will work.
- Can I control grade settings remotely without using a smartphone?
- Absolutely. The included RC40 handheld remote controls grade adjustments and rotation speed from up to 330 feet away without needing a smartphone or the Bosch app. The Bluetooth app connection is an additional option, not a requirement for operation.
- What is the difference between single-slope and dual-slope mode on the GRL4000-80CH?
- In single-slope mode, the laser sets a grade on one axis while the other remains level. In dual-slope mode, both the X and Y axes are independently graded at the same time — critical for applications like crowned roads, complex drainage planes, or any surface that must shed water in two directions simultaneously.
- Is the GRL4000-80CH rated for outdoor use in wet conditions?
- Yes. The GRL4000-80CH carries an IP67 protection rating, meaning it is completely dust-tight and can withstand immersion in up to 1 meter of water for 30 minutes. It is built for active outdoor jobsite conditions including rain and dusty environments.
