· 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