Used to control the level of each course of a wall as the corners are built. Made from 50mm x 25mm wooden batten and long enough to reach one storey high of the building; the top of each course is marked, with saw kerfs, to the specified brickwork gauge. Used from a level datum set at external, and internal, corners the rod controls both the vertical rise of the work and its level from corner to corner. The levels of window and door heads can be included.