... compensation 4. Anjun ph indicator controller with High QualityApplicationIndustrial waste water,pure water, circulating ... , electronic semiconductor, chemical, pharmaceutical, etcFeatures:1.High impedance preamplifier, strong ability of anti-interference 2 ... accumulated10.Repeatability: 0.1% of measuring range11.Power requirement:90~130VAC,50/60HZ(MAX 10VA) ... ph indicator controller with High Quality