Levelling requires the use of a optical survey level and a number of other pieces of equipment. It is necessary to assemble all of the equipment together and check that it is in good order prior to conducting a level survey . It is pointless to attempt to conduct a level survey if any item is missing, or if a vital item is not in correct adjustment.

The basic items required for Levelling are:-

• The level - the instrument used to define a horizontal line of sight.
• Survey tripod - used to support the level.
• Survey staff - a graduated staff used to determine vertical heights.
• Change Plate - a small flat metal plate with a raised point in the centre that is used to support the staff on the ground. The plate is firmly embedded into the ground to stop the staff from subsiding.

• Staff bubble - a small bulls eye bubble that is held to the side of the staff to ensure it is held vertical.
• Level booking Sheet or Level field book