TRUE BLUE BOX BEAM 72" ALUMINUM LEVEL

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 rubber endcaps for extreme shock resistance.