... .LCD digital indicator with back light 3.Temperature compensation 4. Anjun ph indicator controller with High QualityApplicationIndustrial waste water,pure water, ... and dyeing, electronic semiconductor, chemical, pharmaceutical, etcFeatures:1.High impedance preamplifier, strong ability of anti-interference 2.Transmission distance ... 96*125mm13.N.W: 1 KG Anjun ph indicator controller with High Quality