S.L. 427.19 Art. 24that its cutting centre of the In order positioned as

GRASS TRIMMERS/GRASS EDGE TRIMMERS See No 2 The trimmer shall be positioned by a suitable device in such a way device is above the centre of the hemisphere. For grass trimmers, the cutting device shall be held at a distance of about 50 mm above the surface. to accommodate the cutting blades, grass edge trimmers should be close as possible to the test surface