... PH 3.Working voltage: 220VAC 10%, 50/60HZ ApplicationWidely used in environmental protection, sewage treatment, thermal power, breeding, ... food processing, printing, metallurgy, pharmacy, fermentation, chemical industry, water and other solution PH value of the online detection,swimming ... .Weight: 0.9 Kg High accuracy online PH controller/PH probe/water treatment PH analyzer with signal output 4-20mA