Installations for surveying purposes; levelling staffs (surveying instruments); rods (surveying instruments); surveying apparatus and instruments; surveying instruments; apparatus for measuring distance; apparatus for measuring pressure; coordinate measuring instruments; digital measuring instruments; electrical measuring instruments; electronic distance measuring instruments; hand held lasers for measuring distances; instruments for measuring angles; instruments for measuring gradients; instruments for measuring length; instruments for measuring pressure; map measuring instruments; measuring devices having digital displays (other than for medical use); measuring instruments; measuring instruments for civil engineering; measuring rulers; measuring sensors; measuring t-squares; measuring wheels; rulers (measuring instruments); rules (measuring instruments); sensors for measuring depth; set squares (measuring); sliding callipers for measuring; sliding squares (measuring instruments)