ASTM: C 403
It is used for finding out the rate of hardening of mortar sieved from
concrete spring and a stem graduated from 0-70 kg x 1 kg. Six
interchangeable penetration needles of areas 645, 323, 65 32 and
16mm sq. Is provided . The penetration resistance is measured by the
force exerted to penetrate the mortar by 25mm and is indicated by a
sliding ring on the stem, which is graduated. Needle shanks are
marked at every 12.5mm. Complete in a wooden carrying case.