My co-worker is using an ORP (Redox) electrode to measure the same solution as I, but our readings are not even close. Could there be something wrong with my electrode?
No. Because ORP (Redox) is a relative measurement, it is almost impossible to compare two ORP electrodes directly. ORP electrodes come equipped with bands made up of platinum, gold, or hydrogen, for example. Each band type will give you a different reading in the same solution. Even if the electrodes are of the same band type, the leak rate through the reference junction will affect your readings. Instead, simply measure two solutions and note the difference between the two electrodes. Once again, the difference between two solutions should compare. You should be looking for a change of state, rather than an absolute measurement. You can check your electrode using pH buffer and Quinhydrone.
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