<P> Some tapes sold in the United States have additional marks in the shape of small black diamonds, which appear every 19.2 inches (48.77 cm). These are used to mark out equal spacing for joists (five joists or trusses per standard 8 - foot (243.8 cm) length of building material). </P> <P> Many tapes also have special markings every 16 inches (40.6 cm), which is a standard interval for studs in construction . Three spaces of 16 inches make exactly 4 feet (121.9 cm) which is the commercial width of a sheet of plywood, gyprock or particle board . </P> <P> It should also be mentioned that the sale of dual metric / customary scale tapes is slowly becoming common in the United States . For example, in some Walmarts there are Hyper Tough brand tapes available in US customary units and Metric units . Unlike US rulers, of which an overwhelming majority contain both cm and inch scales, tape measures are longer and thus traditionally have had scales in both inches and feet + inches . So, inclusion of a metric scale requires the measuring device to either contain 3 scales of measure or the elimination of one of the customary scales . </P> <P> Tape measures sold in the UK often have dual scales for metric and imperial units . Like the American tape measures described above, they also have markings every 16 in (40.6 cm) and 19.2 in (48.8 cm). </P>

What is 2 meters on a tape measure