Features Digital display of sampling speed; Load pressure and sampling time are adjustable (the polishing time is pre-settable) Grinding-polishing disc has two functions of two-step constant speed and stepless speed change; The spindle of grinding-polishing head is stepless speed change; Handsome durable ABS casing and stainless steel standard parts; Central force loading; Automatic distribution system of large-volume grinding materials (the polishing suspension can be added via an automatic material dropper automatically). Process six samples simultaneously; The machine has function of "One Key Recovery".