brand new and high quality OOTDTY Features: Industrial online dissolved oxygen meter is an intelligent online continuous real-time monitoring instrument, and the sensor adopts a polarographic coated dissolved oxygen electrode. Monitor is widely used in power plants, petrochemical, metallurgical electronics, mining, paper, biological fermentation, food and beverage, sewage treatment, aquaculture and other industries. It can dissolved oxygen value and temperature measurement, upper and lower limit control, current output, and digital communication. Automatic temperature compensation. Can high limit alarm and low limit alarm, dual-circuit relays. Audible alarm can be turned on/off, it can be set on or off through the interface options. Specifications: Product name: Dissolved Oxygen Monitor Measuring range: 0-20mg/L Resolution: 0.1mg/L Error: ±0.3mg/L Display mode: 128 * 64 dot matrix LCD Temperature compensation: 0-40 & 8451; automatic Current output: 4-20mA Alarm output: a set of high and low limit alarm contacts Power supply: 220V±10% 50Hz Power consumption: ≤3W Temperature range: 0& 65374;60 & 8451; Humidity: ≤85%RH Material: ABS Package Size: app.26x25x15cm/10.24x9.84x5.91in Color: As pictures shown Quantity: 1set Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1set x Dissolved Oxygen Monitor(other accessories demo in the picture is not included.)