... value, temperature, output current, alarm point shows , intuitive and easy to read, and a range transfinite tip.3. Screen display alarm state ... : ug/L: plus or minus 1.0% FS; Mg/L: plus or minus 0.5% FS, + / - 0.3°C4.Automatic temperature ... , breeding, medicine, Tap water, etc. High quality and cheap disslved oxygen controller for Water and wastewater treatment plant measuring/DO probes/DO sensor