Empire E75.72 True Blue Box Beam Level, 72", AluminumHighlights: Material: Aluminum Series: E70 Accuracy: 0. 0005" Length: 72" Vial Positions: Level Plumb Vial Material: Acrylic Vial Type: Solid Block Includes: 1 Level 2 Plumb True Blue vials are accurate to within 0. 0005" per inch in all 10 level and plumb working positions Heavy duty 6061 aircraft aluminum chassis with 300 degree view top reading level vial Solid block acrylic vials won't break,leak or fog Milled edges for accuracy with dual molded