... wastewater, printing and dyeing, electronic semiconductor, chemical, pharmaceutical, etcFeatures:1.High impedance preamplifier, strong ability of anti-interference 2.Transmission distance ... electrode is 100m3.Isolation type 4~20mA output, using optical coupling isolation output technology4.LCD digital indicator with back light5.With ... *125mm13.N.W: 1 KG Anjun ph indicator controller with High Quality