... oxygen value, temperature, output current, alarm point shows , intuitive and easy to read, and a range transfinite tip.3. Screen display ... 50/60hz11.Feet inches: 96 x 96 x 115 mm12. Open hole size: 91 x 91 mm13. Heavy volume: 0.9 ... protection water treatment, biological fermentation, breeding, medicine, Tap water, etc. High quality and cheap disslved oxygen controller for Water and wastewater treatment ...