Folding Surveyor's Stake Out Aid (Pack of 10 Units)This Folding Surveyors Stake Out Aid was built specifically for setting out work on the batter boards and on the floor slab. There is no need for precise plumbing of the prism pole. Its orientation scales for backwards and forward use. Surveying axes on a board made quick and easy Accurate dimensional data transfer Precise plumbing with prism pole is not needed Small and compact Return: 14 days money back or replacement buyer pays return shipping 20%