Stanley 42-240 24-Inch Professional I-Beam Level Aluminum Imported Heavy-duty Aluminum I-beam Construction Provides Rigidity & Accuracy Level Accuracy Of .0015" 360deg Vials Set Directly Into Frame & Never Need Adjustment Heavy-duty aluminum I-beam construction provides rigidity and accuracy Level accuracy of 0.0015 in. /in. (0.15mm/m) 360 vials set directly into frame never need adjustment Large, clear acrylic vial covers and top-read center vial ease readability. Yellow powder-coated body with high-visibility accents easy to spot on job site Limited Lifetime Warranty