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The UNI-T LM555LD is a professional-grade, 5-line green beam laser level engineered for precision alignment and layout tasks in construction, renovation, and interior design. This advanced instrument projects highly visible green laser lines for accurate leveling and layout across a wide range of applications .
Designed to withstand challenging job site conditions, the LM555LD features IP54 dust and water resistance, ensuring reliable operation in harsh environments . With its powerful 4000mAh rechargeable battery, rapid self-leveling mechanism, 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 enhanced visibility. The LD green light source (510-515nm) provides exceptional brightness, making lines clearly visible even in well-lit indoor environments .
High-Precision Self-Leveling: Advanced gravity pendulum magnetic damping system ensures automatic leveling within ±3.5° . Self-leveling time is under 3 seconds, and an audible alarm alerts when the instrument is outside the leveling range .
Superior Accuracy: Delivers professional-grade accuracy of ±2mm at 10m (±2mm@10m) for horizontal and vertical lines, ensuring reliable results for demanding applications . Lower reference point accuracy is 1mm at 70cm .
Impressive Working Range: Projects visible lines up to 20 meters and points up to 25 meters under 200 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 Micro-USB charging interface . Provides >5 hours of continuous operation with all lasers active .
360° Fine Adjustment: Features 360-degree dual micro-adjustment knobs for precise positioning and alignment, reducing setup errors and allowing accurate targeting .
Versatile Slope Mode: With a tripod and adapter, the instrument can be slashed in multiple directions at 180° for inclined applications such as staircase installation, drainage layout, and angled construction .
Rotating Base with Tripod Mount: Features a rotating base with standard 5/8″ tripod thread for easy mounting on professional tripods .
Rugged Durability: IP54 rating provides protection against dust ingress and water splashes from any direction . Feet are covered with soft rubber for excellent anti-slip performance .
Complete Accessory Package: Includes safety goggles, power adapter, USB cable, mark ruler, and a rugged tool box for storage and transport .
| Specification | Detail |
|---|---|
| Model | LM555LD |
| Brand | UNI-T (优利德) |
| Laser Type | Green LD (510-515nm) |
| Laser Class | Class 2 (<1mW) |
| Line Type | 4V1H 1D (4 Vertical, 1 Horizontal, 1 Down Point) |
| Expanded Angle | Horizontal ≥130°, Vertical ≥110° |
| Line Width | 3mm – 4mm at 10m |
| H/V Accuracy | ±2mm at 10m |
| Lower Point Accuracy | 1mm at 70cm |
| Self-Leveling Range | ±3.5° |
| Self-Leveling Method | Gravity pendulum magnetic damping |
| Self-Leveling Time | <3 seconds |
| Working Distance | Line 20m, Point 25m @200lux |
| Operating Time | >5 hours (all lasers on) |
| Power Supply | 3.7V Li-ion rechargeable battery, 4000mAh |
| Charging Interface | Micro-USB |
| Battery Level Indicator | Yes (Green/Yellow/Red for High/Medium/Low) |
| IP Rating | IP54 |
| Operating Temperature | -5°C to 40°C |
| Storage Temperature | -20°C to 60°C |
| Product Dimensions | 126mm × 120mm × 204.5mm |
| Product Net Weight | Approximately 1kg |
| Tripod Mount | Standard 5/8″ thread |
| Standard Accessories | Safety goggles, adapter, USB cable, mark ruler, English manual |
| Packing | Gift box, tool box |
The LM555LD projects 4 vertical lines and 1 horizontal line (4V1H) with an additional down point . The LD green light source (510-515nm) offers superior visibility compared to standard red lasers, making the lines clearly visible even in challenging lighting conditions .
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 under 3 seconds . If the instrument is placed outside the leveling range, an audible alarm alerts the user, preventing inaccurate measurements .
The LM555LD features a lock function that disables the self-leveling mechanism, allowing you to project lines at any angle for inclined applications . With a tripod and adapter, it can be slashed in multiple directions at 180° . This is ideal for:
Installing stair railings
Laying drainage pipes with proper slope
Setting up angled architectural features
Sloped wall construction
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 instrument features a rotating base with a standard 5/8″ tripod thread, ensuring 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 (Green/Yellow/Red for High/Medium/Low) so you always know remaining power . The Micro-USB interface allows for convenient charging .
The LM555LD features IP54 dust and water resistance, ensuring reliable operation in harsh job site conditions . The feet are covered with soft rubber for excellent anti-slip performance on various surfaces .
The UNI-T LM555LD is an ideal all-in-one tool for:
Horizontal and vertical reference line marking for building construction
Foundation layout and wall alignment
Structural framing and column placement
Quality control and inspection
Wallpaper and tile alignment
Cabinet and shelf installation
Picture hanging and mirror placement
Kitchen and bathroom renovations
Room partitioning and layout
Floor tile and wood floor installation leveling
Ensuring flat and level surfaces for paving
Door and window framing
Staircase installation (with slope mode)
Deck and patio construction
Equipment alignment and installation
Racking and shelving systems
Partition wall construction
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 (5V 1A recommended) . 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 -5°C to 40°C; avoid extreme temperatures and humidity .
Avoid Impacts: While rugged with IP54 rating, 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 LM555LD 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 description states that the LM555LD "enables you 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 appreciate the green laser's brightness and clarity, even in well-lit indoor environments .
Accuracy: The ±2mm@10m accuracy provides reliable results for professional applications.
Battery Life: The 4000mAh detachable battery with Micro-USB charging is frequently highlighted as a major convenience feature .
Durability: The IP54 rating and rugged construction provide confidence in job site conditions .
Versatility: The combination of 5 lines and slope mode covers virtually all leveling scenarios .
Outdoor Range: For maximum range in bright sunlight, working distances are specified at 200lux .
Weight: At approximately 1kg, it's substantial but appropriate for a professional-grade instrument .
Charging: Uses Micro-USB (ensure cable is kept accessible) .
The UNI-T LM555LD represents a professional-grade laser leveling solution, delivering exceptional performance with its 5-line green beam coverage, high-precision self-leveling system, versatile slope mode, and long-lasting 4000mAh battery. Its IP54 dust and water resistance and rugged construction make it exceptionally well-suited for demanding job site conditions .
Whether you're laying out a foundation, installing kitchen cabinets, running electrical conduit, leveling a deck, or working on sloped surfaces, the LM555LD delivers the precision, reliability, and versatility you need. With its intuitive operation, 360° fine adjustment, and complete accessory package, it's a smart investment for anyone who values accurate leveling and alignment
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