... back light 3.Temperature compensation 4. Drinking water,Swimming pool and Tap water PH controller/PH meter/PH electrode ... water,food wastewater treatment, desulfurization pickling, waste water treatment, glass carving process, electroplating wastewater, printing and dyeing, electronic semiconductor ... 96*125mm13.N.W: 1 KG Drinking water,Swimming pool and Tap water PH controller/PH meter/PH electrode