I bought an additional Apex ph probe, so now I have two. I have calibrated them both several times with 7.01 and 10.01 calibration fluid. They sit within an inch of each other but when I put them in the tank, they give readings that are over 25 points off from each other. When I stick each of them separately in the 7.01 and 10.01 fluid, they are dead on accurate. When I put them back in the tank, 25 point difference- like one reads 8.25 and the other 7.99.
Anyone have this issue? Any way to solve this? Makes me question the whole accuracy of apex probes all together.
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