SitePro ALW20 Aluminum Heavy Duty Wing Screw Tripod

The Spectra Precision LL300S-BL is a compact, single-grade self-leveling rotary laser built for contractors and field crews who need fast, reliable horizontal reference on the job site. Designed to withstand the rigors of daily construction use, the LL300S-BL delivers consistent accuracy across a wide range of applications — from rough grading and concrete formwork to interior framing and finish leveling. This laser-only unit pairs with Spectra-compatible grade rods and receivers, making it an ideal base unit for crews already running Spectra tooling in the field.

Overview & Jobsite Applications

The LL300S-BL is purpose-built for horizontal leveling tasks that demand both precision and speed. Its automatic self-leveling mechanism compensates within ±5° of level, eliminating the need for tedious manual adjustment on most setups. Whether you're establishing benchmark elevations across a slab, controlling grade on a drainage project, or setting form heights for a foundation pour, the LL300S-BL gets you on grade fast and keeps you there. The long-range capability — up to 800 meters in diameter with a compatible receiver — means one instrument can serve large footprints without repositioning.

Key Specifications

• Self-Leveling Range: ±5° automatic compensation
• Accuracy: ±1.5mm at 30m (±1/16 in. at 100 ft)
• Operating Range: Up to 800m diameter with compatible receiver
• Rotation Speed: 0, 150, 300, 600 RPM selectable
• Laser Class: Class 3R, 635nm visible red beam
• Battery Life: Up to 100 hours on alkaline D-cell batteries
• IP Rating: IP55 — dust and water jet resistant
• Operating Temperature: -20°C to +50°C (-4°F to 122°F)
• Mounting Thread: 5/8" x 11 standard tripod thread
• Weight: Approx. 2.1 kg (4.6 lbs) without batteries

Key Features

• Automatic Self-Leveling: Powered pendulum compensation gets you on grade in seconds — no bubble vials to fuss with under field conditions
• Out-of-Level Alarm: Audible and visual alert shuts down the beam if the instrument is bumped out of leveling range, preventing costly grade errors
• Selectable Rotation Speeds: 150, 300, and 600 RPM settings let you optimize visibility versus receiver detection speed for your application
• Static Beam Mode: Lock the beam at any position for single-point alignment, plumb transfer, or reference marking without rotation
• Long Battery Life: Up to 100 hours on standard D-cell alkalines keeps the instrument running through extended projects without constant battery swaps
• IP55 Weatherproofing: Sealed against dust ingress and water jets — built to run in rain, concrete dust, and heavy site conditions
• Compact, Balanced Design: Low center of gravity and robust housing resist tip-overs and simplify transport between setups

Job Applications

Concrete Formwork & Flatwork: Set and verify form heights quickly across large slab pours. The LL300S-BL's accuracy and stable beam give concrete crews a reliable reference for screeding and finishing operations.

Site Grading & Drainage: Establish consistent grade references across rough terrain. Pair with a Spectra CR600 or compatible receiver on a grade rod to maintain elevation control over long sight lines.

Foundation Layout & Elevation Control: Transfer benchmark elevations to batter boards, anchor bolt templates, and foundation walls with the precision required for structural compliance.

Interior Framing & Suspended Ceilings: Use static beam mode or slow rotation for establishing level lines on walls and columns during steel stud framing, drywall layout, and ceiling grid installation.

Compatible Accessories

• Spectra CR600 Laser Receiver — long-range detector for outdoor use in bright conditions
• Spectra HL760 Laser Receiver — dual-sided display for grade rod mounting
• Spectra Aluminum Grade Rod — direct-reading rod compatible with HL-series receivers
• Heavy-Duty Tripod for Rotary Lasers — 5/8"x11 thread, extends to 165cm
• Spectra Laser Detector Clamp — universal rod mount for CR600 and HL760 receivers
• Replacement D-Cell Battery Pack (4-pack)

Related Guides

• How to Set Up a Rotary Laser on a Construction Site
• Choosing the Right Laser Receiver for Your Rotary Laser
• Rotary Laser vs. Line Laser: Which Do You Need?
• How to Check and Verify Rotary Laser Accuracy in the Field

Frequently Asked Questions

Does the LL300S-BL include a receiver?

No — the LL300S-BL is a laser-only unit. A compatible receiver such as the Spectra CR600 or HL760 is required for outdoor use in daylight conditions where the beam is not visible to the naked eye. Receivers are sold separately and are available on this site.

What is the working range of the LL300S-BL?

The LL300S-BL has an operating diameter of up to 800 meters (approximately 2,600 feet) when used with a compatible laser receiver. Without a receiver, visible range depends on ambient light conditions and is typically limited to indoor or low-light environments.

Can the LL300S-BL be used for slope or grade applications?

The LL300S-BL is a single-grade, self-leveling instrument only — it does not have a manual grade or dual-grade mode. For applications requiring a set slope percentage, consider the Spectra LL300N or LL500 series, which offer single or dual-axis grade capability.

Is the LL300S-BL covered by a warranty?

Yes. Spectra Precision backs the LL300S-BL with a limited manufacturer warranty. As an authorized Spectra dealer, Express Tools can assist with warranty claims and factory service coordination. Contact our team for details on coverage terms and service options.