Kevin J.: Is it worth it to get a pH / ORP dual function meter?
The known dual function meters are in the redox measurement range and are “work calibrated” and cannot be re-calibrated, which is actually needed with every measurement of activated water. Do not buy!
A redox meter is more expensive than a pH meter. Yet the same limitations apply as described under the key word —> pH measurements.
So far the most stable ORP electrode I found in a device from “American Marine Pinpoint”. But, like I have said, this is for specialists and one has to exchange the electrodes frequently for a lot of money, since especially the acidic activated water attacks them very quickly.
To determine exact values it is absolutely necessary to polish the electrodes after every measurement with the mostly not delivered and very expensive polishing strips. If you forget to do that you will obtain completely wrong measurements.
The measured redox potential with the usual redox metres (CSE = Common Silver Electrode, sometimes also called Ag/AgCl) do not correspond with the scientific standard Eh (sometimes also SHE = Standard Hydrogenium Electrode). When comparing the measurements you have to indicate which electrode reference is used. There are also electrodes with mercury or gold, for which there is no abbreviation. These also have to be indicated with the measurement. If not, the values hang in mid-air, for ORP values are only a reference value to a certain electrode.
Conversion: CSE (mV) + 207 mV = Eh and reversed Eh (SHE) mV – 207 mV = CSE. The reference temperature amounts to 250 C. Good devices register the temperature and correct the corresponding measurement. Besides, there are also reference electrodes of a particular kind with other conversion parameters, but CSE and SHE are the most used.
The safest would be to have the measurement of dissolved hydrogen which determines the relevant ORP. These specific measurement devices are very expensive and belong in the hands of specialists.
A simple homemade verification of the negative redox potential of alkaline activated water is, for example, the iodine test. Alkaline water does not turn brown with one drop of iodine.
Excerpt from the book “Karl Heinz Asenbaum: Electrically activated water – An invention with extraordinary potential.”
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