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Precision Aluminum Alloy I Beam Spirit Level Tool for Accurate Measurements. Durable Aluminum Construction: Features anodized aluminum alloy body with 1.0mm thickness for drop resistance. Stable Glycerin-Filled Vials: Equipped with barrel vials filled with glycerin for stable readings in real-world conditions. Comprehensive Certifications: Certified with ANS, GB, CE, and ISO standards for global compliance. OEM/ODM Services: Supports full customization including logo, packaging, and artwork design. Rigorous Quality Control: Every unit undergoes manual accuracy testing on granite reference tables before shipment. Wide Size Range: Available in lengths from 30cm to 120cm (12' to 72') to suit various needs.