The Moore & Wright Engineer's Levels have a precision ground cast base with a V-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 ELM Engineer's Levels has the following specification Length 300mm (12in). Width 36mm (1.42in). Height 58mm (2.28in). Resoultion 0.3mm per metre (0.0035in per foot).