This jack is
specially designed to have the lowest possible leak rate so it can be used for
generating forces in most precise calibration work. The two-speed pump advances the ram quickly until about 750
p.s.i. is reached and then more slowly. An
auxiliary screw piston allows loads to be applied in small increments.
Available in capacities to 1,000,000 pounds for compression loading and
to 200,000 pounds for tension/compression loading.