... wastewater, printing and dyeing, electronic semiconductor, chemical, pharmaceutical, etcFeatures:1.High impedance preamplifier, strong ability of anti-interference 2.Transmission distance ... digital indicator with back light5.With upper and lower limit alarm, 2 separate 220VAC/3A relay output6.Automatic temperature compensation from ... *125mm13.N.W: 1 KG Anjun ph indicator controller with High Quality