The Moore & Wright Engineer\'s Levels have a precision ground cast base with a vee groove for location on cylindrical work. Each level is fitted with a main, cross and plumb vial and the main vial is protected by a rotating shroud. The solution in the vials maintains colour and fluidity under all workshop conditions and the main vial has a sensitivity of 1 minute.The Moore & Wright ELS Engineers Level has the following specification: Length: 165mm (6.5in).Width: 34mm (1.34in).Height: 46mm (1.81in).Resolution: 0.3mm per metre (0.0035in per foot).