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).Resolution: 0.3mm per metre (0.0035in per foot).