Empire EM71.8 Professional True Blue Magnetic Box Level, 8" Blue-Banded Vials highlight bubble edges and improve readability True Blue Solid Block Acrylic Vials resist breaking, leaking and fogging - 400% Stronger than standard vials 300-degree view true blue vials with top-reading window for easy readings Patented True Blue Vials are accurate to within .0005 in per inch in all working positions Heavy-Duty 6061 T5 Aircraft Aluminum Chassis provides durability