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The UNI-T LM550G-LD is a professional-grade, 5-line green beam laser level engineered for construction professionals, interior designers, and DIY enthusiasts who demand precision, visibility, and reliability. As the flagship model in UNI-T's LM series, this instrument projects highly visible green laser lines for accurate leveling, alignment, and layout tasks across a wide range of applications .
Designed to tackle the most challenging job site conditions, the LM550G-LD features advanced gravity pendulum magnetic damping self-leveling technology, ensuring precise and stable laser projection even on uneven surfaces . With its powerful 4000mAh rechargeable battery, intuitive touch-sensitive controls, and rugged construction, this laser level is an indispensable tool for building construction, home decoration, furniture installation, and professional surveying .
5-Line Green Beam Projection: Projects 4 vertical lines and 1 horizontal line (4V1H) with 6 enhanced laser points for comprehensive coverage . The LD green light source (510-515nm) provides exceptional brightness and visibility, even in challenging lighting conditions .
High-Precision Self-Leveling: Advanced gravity pendulum magnetic damping system ensures automatic leveling within ±3.5° . The self-leveling time is ≤5 seconds, and an audible alarm alerts when the instrument is outside the leveling range .
Superior Accuracy: Delivers professional-grade accuracy of ±3mm at 10m (±3mm@10m) or ±2mm at 7m (±2mm@7m), ensuring reliable results for demanding applications .
Impressive Working Range: Projects visible lines up to 20 meters and points up to 25 meters under 300 lux ambient light conditions, suitable for both indoor and outdoor applications .
Long-Lasting Rechargeable Battery: Powered by a high-capacity 4000mAh detachable Li-ion battery with USB interface for simultaneous charging and power supply. Provides >5 hours of continuous operation with all lasers active .
Versatile Manual Mode: Features a lock function for inclined operation, allowing you to project lines at any angle for sloped applications such as staircase installation or drainage layout .
Outdoor Pulse Mode: Built-in pulse function enhances laser visibility in bright outdoor environments when used with a compatible receiver (not included) .
360° Fine Adjustment: Equipped with 360-degree dual micro-adjustment knobs for precise positioning and alignment, reducing setup errors .
Rotating Base with Scale: Features a rotating base with a graduated scale and standard 5/8″ tripod thread for easy mounting and accurate angular measurements .
User-Friendly Touch Buttons: Intuitive touch-sensitive buttons (H/V/Outdoor) allow for easy mode selection, even while wearing gloves .
Complete Accessory Package: Includes safety goggles, power adapter, mark ruler, detachable Li-ion battery, carrying strap, and a rugged tool box for storage and transport .
The UNI-T LM550G-LD delivers professional-grade performance across all key leveling parameters.
| Item | Quantity |
|---|---|
| UNI-T LM550G-LD Laser Leveler | 1x |
| 4000mAh Li-ion Rechargeable Battery | 1x |
| Power Adapter (Charger) | 1x |
| Safety Goggles | 1x |
| Mark Ruler / Target Plate | 1x |
| Carrying Strap | 1x |
| User Manual | 1x |
| Rugged Tool Box / Gift Box | 1x |
The LM550G-LD projects 4 vertical lines and 1 horizontal line (4V1H) with 6 enhanced laser points, providing comprehensive coverage for all leveling and alignment tasks . The LD green light source (510-515nm) offers superior visibility compared to standard red lasers, making the lines clearly visible even in well-lit indoor environments .
The advanced gravity pendulum with magnetic damping system ensures automatic leveling within ±3.5° . When the instrument is placed on a surface within this range, it automatically levels itself in ≤5 seconds . If the instrument is placed outside the leveling range, an audible alarm alerts the user, preventing inaccurate measurements .
The LM550G-LD features a lock function that disables the self-leveling mechanism, allowing you to project lines at any angle for inclined applications . This is ideal for:
Installing stair railings
Laying drainage pipes with proper slope
Setting up angled architectural features
The built-in pulse function enhances the laser's visibility in bright outdoor environments when used with a compatible laser receiver (not included) . This extends the working range and usability to outdoor job sites.
The 360-degree dual micro-adjustment knobs allow for precise positioning and alignment without moving the tripod . This feature significantly reduces setup time and improves accuracy for tasks requiring exact placement.
The rotating base features a graduated scale, enabling accurate angular measurements and repeatable setups . The standard 5/8″ tripod thread ensures compatibility with most professional tripods .
The 4000mAh detachable Li-ion battery provides >5 hours of continuous operation with all lasers active . The battery features a built-in level indicator so you always know remaining power . The USB interface allows for simultaneous charging and operation, ensuring uninterrupted work .
The touch-sensitive buttons (H/V/Outdoor) allow for easy mode selection, even while wearing work gloves . The simple interface lets you independently control horizontal and vertical lines, as well as activate outdoor pulse mode.
The UNI-T LM550G-LD is an ideal all-in-one tool for:
Foundation layout and wall alignment
Formwork installation and concrete leveling
Structural framing and column placement
Ceiling grid installation
Wallpaper and tile alignment
Cabinet and shelf installation
Picture hanging and mirror placement
Kitchen and bathroom renovations
Conduit and pipe routing
Electrical box alignment
Ductwork installation
Sprinkler system layout
Stud wall construction
Door and window framing
Staircase installation
Deck and patio construction
Equipment alignment and installation
Racking and shelving systems
Conveyor belt leveling
Partition wall construction
Fence and railing installation
Patio and walkway leveling
Retaining wall construction
Landscape lighting layout
| Feature | Benefit |
|---|---|
| 5-Line Green Beam (4V1H) | Comprehensive coverage with 4 vertical and 1 horizontal line—ideal for all leveling and alignment tasks . |
| High-Visibility Green Laser | Up to 4× brighter than red lasers, ensuring clear visibility even in well-lit indoor environments . |
| ±3.5° Self-Leveling Range | Automatically levels on uneven surfaces, saving setup time and ensuring accuracy . |
| Audible Out-of-Level Alarm | Prevents errors by alerting when the instrument is beyond its leveling range . |
| 4000mAh Detachable Battery | Extended runtime with >5 hours of operation; spare batteries can be swapped for continuous work . |
| USB Simultaneous Charging | Never run out of power—charge while you work using a power bank or USB adapter . |
| Manual/Slope Mode | Versatile for inclined applications like staircases, drainage, and architectural features . |
| Outdoor Pulse Mode | Extends usability to bright outdoor environments with a compatible receiver . |
| 360° Fine Adjustment | Precise positioning without moving the tripod—ideal for exacting layout tasks . |
| Touch-Sensitive Controls | Easy operation even with gloves on—perfect for job site conditions . |
| Complete Accessory Package | Tool box, safety goggles, battery, charger, mark ruler—ready to use out of the box . |
| Trusted UNI-T Quality | Backed by UNI-T's reputation for reliable test and measurement equipment . |
The UNI-T LM series offers three models with varying laser configurations:
| Feature | LM550G-LD | LM530G-LD | LM520G-LD |
|---|---|---|---|
| Laser Type | 4V1H (5 lines) | 2V1H (3 lines) | 1V1H (2 lines) |
| Laser Points | 6 points | 4 points | 3 points |
| Coverage | Maximum (4 vertical lines) | Medium | Basic |
| Best For | Full-room layout, complex projects | General construction | Basic leveling tasks |
Laser Safety: Class 2 laser (<1mW) is safe for general use, but never aim the laser directly at eyes or stare into the beam. Always use the included safety goggles for protection .
Battery Care: Use the included 4000mAh Li-ion battery with the provided charger. Remove the battery if storing for extended periods to prevent leakage .
Lens Cleaning: Keep the laser windows clean using a soft, dry cloth. Avoid touching optical surfaces with fingers.
Environmental Limits: Operate within -10°C to 40°C; avoid extreme temperatures and humidity .
Avoid Impacts: While rugged, avoid dropping or striking the device to maintain calibration accuracy .
Storage: Store in a dry, ventilated place when not in use. Use the included tool box for protection .
Tripod Use: Ensure the tripod is stable and secure before mounting the instrument .
The UNI-T LM550G-LD is widely recognized as a professional-grade laser level that delivers exceptional value, accuracy, and versatility. Its combination of 5-line green beam projection, high-visibility laser technology, robust self-leveling system, and long-lasting battery makes it an indispensable tool for construction professionals, interior designers, and serious DIY enthusiasts .
The official UNI-T product page describes the LM series as enabling users to "locate horizontal line, vertical line, and V-H cross-point accurately," making it a "perfect tool for building construction, home decoration, renovation, furniture installation, flooring, and project layout" .
Visibility: Users consistently praise the green laser's brightness and clarity, even in challenging lighting conditions .
Accuracy: The ±3mm@10m accuracy provides reliable results for professional applications .
Battery Life: The 4000mAh detachable battery with USB charging is frequently highlighted as a major convenience feature .
Versatility: The combination of 5 lines, manual mode, and outdoor pulse function covers virtually all leveling scenarios .
Build Quality: The rugged construction and included tool box provide confidence in job site conditions .
Outdoor Range: For maximum range in bright sunlight, a compatible laser receiver is recommended .
Weight: At approximately 1kg, it's substantial but appropriate for a professional-grade instrument .
Learning Curve: The comprehensive features may require some familiarization for new users .
The UNI-T LM550G-LD represents the pinnacle of laser leveling technology in UNI-T's lineup, delivering professional-grade performance with the most comprehensive 5-line coverage of the LM series. Its bright green beam, high-precision self-leveling system, versatile manual mode, and long-lasting 4000mAh battery make it exceptionally well-suited for construction professionals, interior designers, and serious DIY enthusiasts who demand the best
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