... which can communicate with computer.Struction: From lab scale to pilot scale, floor stand ,two different fermentors vessel with one control ... .01 pH, control precision ± 0.01 pH; 4. It has auto alarm function. 5.pH sensor and signal transmission line. . 2 ... 0-100% or 0-200%, precision ± 1%; 3. It has auto alarm function; 4. DO sensor and signal transmission line.. 3 ...