The Spectra Precision AL28M is a rugged, 28-power automatic level built for contractors, surveyors, and construction crews who demand consistent accuracy on the jobsite. Sold here as an instrument-only package, this is the smart choice for professionals who already own a compatible tripod and grade rod — you get the same high-performance optics and magnetic dampening system found in the full AL28M kit bundles, without paying for equipment you don't need.
Product Overview
Designed for everyday grade work, foundation layout, elevation checks, and utility installation, the AL28M delivers 1/16-inch accuracy at 100 feet with a wide 28x magnification that keeps readings sharp across long sight distances. The self-leveling compensator uses magnetic dampening to settle quickly and resist vibration from nearby equipment — a critical advantage on active job sites where heavy machinery is running nearby. Whether you're setting forms, checking floor elevations, or running a drainage line, the AL28M gives you a dependable, repeatable reference without fuss.
Key Specifications
- Magnification: 28x
- Accuracy: 1/16" (1.6mm) per 100 feet
- Compensator Type: Magnetic dampening, self-leveling
- Compensator Range: ±15 arcminutes
- Minimum Focus Distance: Approximately 18 inches
- Field of View: 1° 20' (approx. 7 feet at 300 feet)
- Objective Lens Diameter: 36mm
- Horizontal Circle: 360° graduated
- Waterproof Rating: IP54 splash-resistant
- Package Contents: AL28M instrument only (no tripod, no rod)
Key Features
- Magnetic dampening compensator for fast, stable settling on vibrating job sites
- High-contrast 28x optics for clear readings at extended distances
- Smooth-action horizontal tangent screw for precise angle adjustments
- Circular bubble vial with large, easy-to-read graduation
- IP54 splash-resistant housing stands up to rain and dust
- Standard 5/8" x 11 tripod thread — fits virtually all contractor tripods
- Ergonomic, balanced body for quick setup and transport
- Compact profile fits most instrument cases and transit bags
Job Applications
Foundation and Footing Layout: Establish consistent benchmark elevations around a foundation perimeter. The AL28M's accuracy and 28x magnification make it easy to transfer grades across large pours without re-shooting.
Floor and Slab Leveling: Check high and low spots across concrete slabs or subfloor framing. The wide field of view lets one operator cover a large area from a single instrument setup.
Drainage and Utility Grading: Set pipe slope and invert elevations for storm drains, sanitary sewer, and irrigation lines where consistent fall is critical to system performance.
Landscaping and Site Grading: Run elevation control for grading crews, retaining walls, and hardscape installation where sub-inch tolerances are required but full survey equipment is unnecessary.
Compatible Accessories
- Spectra Precision TP60 Aluminum Tripod — lightweight, adjustable, 5/8" x 11 thread
- Spectra Precision FR Series Fiberglass Grade Rod — available in 13' and 16' lengths
- Spectra Precision AL28M-1 Kit — instrument + tripod + rod bundle
- Instrument Carrying Case for AL Series Levels
- Plumb Bob and Centering Rod Set
Related Guides
- How to Set Up and Level an Optical Auto Level
- Reading a Grade Rod: Tips for Contractors
- Optical Level vs. Laser Level: Which Do You Need?
- Choosing the Right Tripod for Your Instrument
Frequently Asked Questions
- Does the AL28M come with a tripod or grade rod?
- No. The AL28M listed here is the instrument-only version. It ships without a tripod or measuring rod. If you need a complete kit, see the AL28M-1 or AL28M-2 bundle options also available at Express Tools.
- What tripod thread does the AL28M use?
- The AL28M uses a standard 5/8" x 11 thread, which is the most common tripod mount in the construction industry. It is compatible with virtually all contractor-grade aluminum and fiberglass tripods.
- How accurate is the AL28M for foundation work?
- The AL28M delivers 1/16-inch accuracy per 100 feet under normal field conditions. For typical residential and light commercial foundation work, this level of precision is more than sufficient for grade checks, benchmark transfer, and form setting.
- Is the AL28M waterproof enough for outdoor use in rain?
- The AL28M carries an IP54 splash-resistance rating, meaning it is protected against water splashing from any direction and dust ingress under normal working conditions. It is suitable for outdoor use in light rain, but should not be submerged or used in heavy downpours without protection.
