RS20 & RS21* (*self-adhesive)��� ��� Designed to permanently secure marked measurements until plastering is completed.��� Guaranteeing that heights and finished floor levels (FFL) are accurately marked until after plastering.��� Ensuring that axes are reliably marked until the plastering phase concludes.��� The RS20 & RS21 Datum Markers are also available in red, without the "Meterriss" inscription. Article no. RS20r oM and RS21r oM.��� After plastering, the upper edge of the pin serves as the marker for the Datum Markers RS20 and RS21.��� These Datum Markers remain embedded beneath the plaster as evidence.��� RS