Institute of Electronic Engineering;
Chung Yuan Christian University;
Chung-Li;
Taiwan 320;
China;
Graduate School of Electronic Engineering;
National Yunlin University of Science and Technology;
Douliou;
Taiwan 640;
China;
Department of Electrical Engineering;
National Chi Nan University;
Nantou;
Taiwan 545;
China;
multi-sensing system; tin oxide pH electrode; liquid crystal display(LCD); tin oxide electrode-based ion selective electrodes(ISEs); universal serial bus(USB); universal asynchronous receiver transmitter(UART);