The RS21 benchmark targets are installed on an unplastered or unrendered wall to provide a clear datum to all tradesmen. To avoid measurement differences when transferring, the markers have a ledge to which a ruler can be applied. The elastic “stubs” ensure that the datum is stable until after plastering, and easy to find again. Heights and axes are also secured until plastering work is complete. To avoid tampering, the corners are sprayed over in colour. After completing all work, the flexible “stubs” are easily pinched off, the rework is very little, and the markers remain under the plaster as proof. We recommend gluing the datum markers and securing them at least once.
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