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1 <br />1 <br />1 <br />1 <br />1 <br />ECH2O Probe User's Manual <br />2. About the ECH2O Probes <br />Circuiu <br />Sensor <br />Fig 1: E CH2O prod diagram , Fig 2: E C S prod diagram <br />3.5mm plug wiring <br />iring <br />The ECH20 probe comes with a 3.5mm "stereo plug" <br />connector. This allows for rapid connection directly to <br />Decagon's Em50 and Em5 logger to the ECH20 Check. <br />5 <br />