... shows , intuitive and easy to read, and a range transfinite tip.3. Screen display alarm state and at the same time with switch ON/ ... : 4-20mA7. Can restore factory settings.Main technical parameters1.Measuring range: 0 ~ 200.0 ug/L, 0 ~ 20.00 mg ... , breeding, medicine, Tap water, etc. Biological fermentation and aquaculture dissolved oxygen controller with 4-20mA/DO transmitter/DO meter/dissolved oxygen ...