Hi, I have the Apex 2016. I bought 2 new Ph probes and a Ph module. Id like to install a Calcoum reactor and need a 2nd ph probe for the reactor. My issue is after calibrating the probes I get 2 differemt readings . One at 8.05 the other 7.92. I uderstansthatbits not a hugh difference but id expect it to be cloaer. Is this normal and if so which probe should I use in the Reactor? Thanks. For any insights and thoughts on yhis.
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