... 0 ug/L, 0 ~ 20.00 mg/L 2.Resolution: 0.1 ug/L, 0.01mg/L The main functions ... .0 ug/L, 0 ~ 20.00 mg/L 2.Resolution: 0.1 ug/L, 0.01mg/L, 0.1° ... two groups of ON/OFF relay contact, divided into high and low alarm signal photoelectric isolation output.6.Signal ... , breeding, medicine, Tap water, etc. High quality and cheap disslved oxygen controller for Water and wastewater treatment plant measuring/DO ...