Neptune Systems APEX Double Junction Lab Grade PH Probe
Neptune Systems APEX Double Junction Lab Grade PH Probe
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Neptune Systems APEX Double Junction Lab Grade PH Probe

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Double junction probes place a second vessel inside the main electrolyte with a second internal junction. The means that even when the aquarium water eventually begins to make its way in the first compartment, it still has to go through the second junction to contaminate the electrolyte surrounding the reference electrode.