Û¢ Patented anti-shock protection: items out of line can be immediately corrected with a tap from a trowel. The need to change tools is reduced. One of the two vertical vials is moved towards the middle, making reading easier. Easy to clean due to a special coating and chamfered vial housing. Extra-rigid rectangular aluminium profile with reinforcing ribs. Removable shock-absorbing end caps with anti-slip stoppers. Milled measuring surface.