... 4. Anjun ph indicator controller with High QualityApplicationIndustrial waste water,pure water, circulating water,food wastewater treatment, desulfurization pickling, waste ... and dyeing, electronic semiconductor, chemical, pharmaceutical, etcFeatures:1.High impedance preamplifier, strong ability of anti-interference 2.Transmission distance ... .W: 1 KG Anjun ph indicator controller with High Quality