Variable speed peristaltic pump BT300M Flow rates:0.007~1140mL/min Speed ... ,YZ2515x,DG-1 and DG-2 four kinds of pump heads, with flow rate from 0.007-1140mL/min ... changing the tube and material Functions and features1.applicable pump heads: YZ1515x,YZ2515x,DG-1 ,DG-22.two ... ways of changing flow speeds: by hand through switching knobs/ automatic control through external controller interface3. ...