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Global Water’s WQ401 Dissolved Oxygen Sensor is a rugged and reliable water oxygen measuring Speciﬁcations Output 4-20 mA Range 0 to 100% saturation, 0 to 8 ppm, temperature compensated to 25°C Accuracy ±0.5% full scale device. The WQ401’s sensor is attached to 25′ of marine grade cable, with lengths up to 500′ available upon request. The sensor’s output is 4-20 mA with a three wire conﬁguration. The sensor’s electronics are completely encapsulated in marine grade epoxy within a stainless steel housing.
Furthermore, this datasheet explains discussion around marine grade, oxygen sensor, sensor, and output.