... , printing, metallurgy, pharmacy, fermentation, chemical industry, water and other solution PH value of the online detection,swimming pool.Main technical parameters ... Slope plus or minus 30%8.Control interface: two groups of ON/OFF relay contact, divided into high and low alarm ... : 92x92mm17.Weight: 0.9 Kg High accuracy online PH controller/PH probe/water treatment PH analyzer with signal output 4-20mA