Specification: Level Staff is a graduated aluminum rod, used with a leveling instrument to determine the difference in height between points or heights of points above a datum surface. It cannot be used without a leveling instrument. a range of levelling staffs including E-type, bar coded, standard invar and industrial Invar Levelling Staffs. Most of the staffs are sectional and so can be adjusted in length to allow for easy storage and transport. The aluminium staffs adjust with telescopic section inside each other, whilst the wooden versions use sliding slip joints or connections. Sizes: 4/5/6 metres.