The Bosch 18V Green Beam Horizontal Rotary Laser Kit GRL18V-31K is displayed as a complete set against a clean white background. This automatic construction site level transit grading tool kit includes the horizontal green beam rotary laser unit, an 18V lithium-ion battery pack, a fast desktop battery charger, a matching alkaline battery adapter cartridge, an LR20 laser receiver, a heavy-duty aluminum tripod stand, and a multi-section grade rod.
An infographic diagram showcasing the primary technical features of the Bosch automatic construction site level transit over a dark blue backdrop. Connected lines emphasize key product specifications, detailing its long working range spanning a 2,000-foot diameter, a specialized horizontal-only laser head, a simple one-button operation configuration, an IP66 job-site-tough environmental rating, and a high accuracy rating of up to ±1/16-inch at 100 feet.
A close-up view of the Bosch green beam horizontal rotary laser unit mounted securely on its aluminum tripod stand at an active construction site. In the blurry background, a worker wearing a white hard hat and a high-visibility yellow safety vest can be seen mapping out concrete foundation formwork layouts. Large text below notes an easy-to-use rotary laser with a self-leveling range of ±15%.
An action image displays an aluminum building tripod collapsed sideways on a muddy earthworks job site, splashing water across the ground as it falls. A descriptive product banner running along the bottom highlights that the cordless laser level housing is engineered job-site tough and IP66 rated for complete dust-tight and water resistance.
A close-up view of a technician's hands in protective black work gloves sorting battery packs next to the tripod-mounted Bosch grading transit level. The visual demonstration highlights the tool's power flexibility configuration for efficient use with an 18V lithium-ion battery pack or an adjacent open cartridge containing standard C-cell batteries.
A professional marketing warranty graphic for the Bosch Measuring and Layout Tools product series. The clean dark blue and red backdrop features the standard company logo alongside a bold visual announcement detailing an official 1-year tool warranty policy, plus an extra 1-year extension when registered within eight weeks of purchase.
New Bosch Rotary Lasers | Bosch WOC 2026 promotional video
The Bosch 18V Green Beam Horizontal Rotary Laser Kit GRL18V-31K is displayed as a complete set against a clean white background. This automatic construction site level transit grading tool kit includes the horizontal green beam rotary laser unit, an 18V lithium-ion battery pack, a fast desktop battery charger, a matching alkaline battery adapter cartridge, an LR20 laser receiver, a heavy-duty aluminum tripod stand, and a multi-section grade rod.
An infographic diagram showcasing the primary technical features of the Bosch automatic construction site level transit over a dark blue backdrop. Connected lines emphasize key product specifications, detailing its long working range spanning a 2,000-foot diameter, a specialized horizontal-only laser head, a simple one-button operation configuration, an IP66 job-site-tough environmental rating, and a high accuracy rating of up to ±1/16-inch at 100 feet.
A close-up view of the Bosch green beam horizontal rotary laser unit mounted securely on its aluminum tripod stand at an active construction site. In the blurry background, a worker wearing a white hard hat and a high-visibility yellow safety vest can be seen mapping out concrete foundation formwork layouts. Large text below notes an easy-to-use rotary laser with a self-leveling range of ±15%.
An action image displays an aluminum building tripod collapsed sideways on a muddy earthworks job site, splashing water across the ground as it falls. A descriptive product banner running along the bottom highlights that the cordless laser level housing is engineered job-site tough and IP66 rated for complete dust-tight and water resistance.
A close-up view of a technician's hands in protective black work gloves sorting battery packs next to the tripod-mounted Bosch grading transit level. The visual demonstration highlights the tool's power flexibility configuration for efficient use with an 18V lithium-ion battery pack or an adjacent open cartridge containing standard C-cell batteries.
A professional marketing warranty graphic for the Bosch Measuring and Layout Tools product series. The clean dark blue and red backdrop features the standard company logo alongside a bold visual announcement detailing an official 1-year tool warranty policy, plus an extra 1-year extension when registered within eight weeks of purchase.
New Bosch Rotary Lasers | Bosch WOC 2026 promotional video
BOSCH

Bosch Rotary Laser Level GRL18V-31K 18V Green Beam Cordless Kit (1000 Feet Range 1/16 Inch Accuracy Self Leveling Grade Transit Construction Tool)

Only 3 left
SKU: GRL18V-31K
$999.00 USD

Description

Bosch Promtional Logo Logout

Bosch 18V Green-Beam Horizontal Rotary Laser Level Kit GRL18V-31K

The Bosch GRL18V-31K 18V Green-Beam Horizontal Rotary Laser Level Kit operates as a commercial-grade construction transit and site-grading system engineered to establish precise horizontal level lines across large jobsites. Featuring a high-visibility green laser diode that projects a beam up to four times brighter than traditional red lasers, this automatic self-leveling rotary laser provides an operational working range of up to 1,000 feet with an accuracy rating of ±1/16 inch at 100 feet. Compatible with 18V AMPShare lithium-ion battery packs or standard C alkaline batteries via an included adapter sleeve, this IP66 dust-tight and water-resistant leveling tool incorporates a simplified one-button interface and a ±15% self-leveling range to streamline concrete formwork alignment, site excavation, and perimeter grading tasks.

Best Used For:

  • Commercial Site Excavation & Foundation Grading: Establishing dead-level grade benchmarks across vast soil footprints using the 1,000-foot diameter range and telescoping grade rod.
  • Concrete Formwork & Slab Pour Alignment: Setting precise horizontal elevations for foundations, footings, and retaining wall forms with ±1/16 in. accuracy at 100 ft.
  • Outdoor Utility & Structural Framing Layout: Aligning fence posts, pipe drainage runs, and structural steel beams on uneven terrain using the rapid ±15% self-leveling system.

Key Performance & Safety Features

  • High-Visibility Green Laser Diode: Projects a bright Class 2 green beam (500–540 nm) that offers up to 4X greater visibility over standard red lasers for extended outdoor layouts.
  • 1,000-Foot Long-Range Precision: Delivers dead-on horizontal alignment up to 1,000 feet in diameter with a tight accuracy rating of ±1/16 in. at 100 ft.
  • IP66 Industrial Environmental Protection: Dust-tight and water-resistant housing seals internal optics against windborne site debris and direct high-pressure water jets.
  • Dual-Source Power Architecture: Operates on the included 18V 4.0Ah AMPShare lithium-ion battery or conventional C alkaline cells using the provided adapter sleeve.
  • One-Button Automated Self-Leveling: Streamlined interface executes automatic self-leveling within ±5° to eliminate manual leveling errors and setup delays.
  • 5-Foot Drop-Tested Structural Frame: Heavy-duty composite casing is engineered and drop-tested to withstand a 5-foot tripod tip-over shock without loss of accuracy.

What's Included

  • (1) GRL18V-3-31G Horizontal Green-Beam Rotary Laser
  • (1) EXBA18V-40 18V 4.0Ah Lithium-Ion Battery
  • (1) GAL18V-40 Fast Battery Charger
  • (1) BA18-C Alkaline Battery Adapter Sleeve
  • (1) LR20 Heavy-Duty Laser Receiver
  • (1) BT170HD Heavy-Duty Aluminum Building Tripod
  • (1) GR8 Aluminum Telescoping Grade Rod
  • (1) Impact-Resistant Plastic Molded Carrying Case

Technical Specifications

Brand Name Bosch
Model Number SKU GRL18V-31K
Voltage Power System 18V DC Lithium-Ion / C Alkaline Dual-Power
Leveling Type Classification Automatic Self-Leveling (Up to 5°)
Laser Beam Wavelength & Color Green High-Visibility (500 nm – 540 nm)
Working Range Diameter Up to 1,000 ft. (304.8 m)
Horizontal Leveling Accuracy ±0.0625 in. at 100 ft. (±1/16 in. at 100 ft.)
Self-Leveling Alignment Range ±15% Slope Alignment Range
Environmental Protection Rating IP66 (Dust-Tight & High-Pressure Water-Resistant)
Laser Class Diode Rating Class 2 Laser Product
Mount Base Threading 5/8 in. - 11 UNC Standard Mounting Thread
Operating Temperature Limits 14°F to 122°F (-10°C to 50°C)
Assembled Tool Dimensions 40.0 in. L x 10.0 in. W x 23.0 in. H
Complete Kit Shipping Weight 39.0 lbs. (17.69 kg)

Pro-Tip: When setting up on soft soil or wet excavation sites, firmly press the tripod legs deep into the ground until the aluminum feet reach hard subsoil before mounting the GRL18V-31K. Setting the legs securely prevents ground settling from shifting your elevation baseline while concrete pours or excavation cuts are underway.