... back light 3.Temperature compensation 4. Anjun ph indicator controller with High QualityApplicationIndustrial waste water,pure water, circulating water ... treatment, glass carving process, electroplating wastewater, printing and dyeing, electronic semiconductor, chemical, pharmaceutical, etcFeatures:1.High impedance preamplifier, strong ... 125mm13.N.W: 1 KG Anjun ph indicator controller with High Quality