The principal scale-mark, beginning the scale, shall be constituted by the base of a sinker of appropriate shape, sufficiently heavy to extend the tape correctly and shall be made of a material not liable to cause sparks on impact.
Glavno oznako skale na začetku skale mora sestavljati temelj grezila z ustrezno obliko in zadostno težo, da pravilno raztegne trak, izdelan iz materiala, ki se ob udarcu ne bo iskril.