ESS Earth Sciences now manufactures Greenspan brand water quality monitoring products. The first two letters of a sensor indicate its function, followed by the sensor series number:

DO = Dissolved Oxygen PR = Pressure (depth) Remote suffix A = Analogue output
EC = Electrical Conductivity PS = Pressure (depth) Submersible suffix D = Digital output
OR = Oxygen Reduction Potential TS = Turbidity Sensor suffix T = Terminal-screw connector
PH = pH (potential of Hydrogen) suffix L = Logging sensor
Multi-parameter logging sensors: MP (Ø47mm, up to 3 sensors) and MQ (Ø65mm, up to 5 sensors)

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