... , 0.1°C3.Fine degree: ug/L: plus or minus 1.0% FS; Mg/L: plus or minus 0.5% FS, + / - 0 ... ma), load < 750Ω (4-20mA)10.Working voltage: 220 VAC plus or minus 10%,50/60hz11.Feet inches: 96 x 96 ... , medicine, Tap water, etc. High quality and cheap disslved oxygen controller for Water and wastewater treatment plant measuring/DO probes/DO sensor