The function of the press knob of the fisher sub sieve sizer?201-60
The press knob of HMK-22 fisher sub sieve sizer rotates counterclockwise and the Rack and Pinion Control moves downward and falls in the sample tube, compacting the powder to the required sample height line, indicated by the particle size pointer on the reading chart. When this knob is rotated clockwise, the Rack and Pinion Control moves upward and leaves the sample tube.
Fisher Sub Sieve Sizer https://www.isizer.com/fisher-sub-sieve-sizer-principle/