Yosemitech - Model Y506-A -Handheld Optical Dissolved Oxygen Sensor

-20mg/L or 0-200% Saturation.  0~50 ?;IP68 rating. Membraneless, no electrodes design. No oxygen consumption.  Flow Independent. Automatic temperature compensation. No H2S Interference. Low Drift, fast response, and more accurate. Low Maintenance, low operating cost. Easy sensor cap replacement. RS-485; MODBUS protocol compatible.