Highly visible red horizontal vial gives user an uninterrupted view of the bubble through a 90 degree viewing angle front viewing plumb site dual view redeffect vial allows user to see plumb vial perfectly from the front accurate to 05 mm per 1 m equal to 0029 degrees in standard position aluminium box section body with milled base and ergonomic curved top that is electrostatically powder coated and baked with polyester acrylic paint two ergo grip soft grip non slip handles oversized impact