... or less9.The output load: load < 500Ω (0-10 ma), load < 750Ω (4-20mA)10.Working voltage: 220 VAC plus or minus ... 10%,50/60hz11.Feet inches: 96 x 96 x ... :Power plant, chemical industry, environmental protection water treatment, biological fermentation, breeding, medicine, Tap water, etc. High quality and cheap disslved oxygen controller for ...