PENCILS FOR MOHS SCALE HARDNESS TEST

Special model manufactured on the basis of 20 years of experience of this type of measuring instrument.
Comprises 8 pencils made from aluminium ø 10 mm, 146 mm long, to which the mineral with a sharpened head is attached. The mineral is
very thick and has a diameter of 6 mm.
The pencils are supplied with an elegant case, in the following hardness:
Mohs 5-5, 5-6-6 ,5-7-7, 5-8-9