When my Halides turned on my PH would always go up .2 or more after i moved my controller to the new location. Moved some cords around, and made it spike up .5 when the halides where on.
Make sure you're not running the wire near ANYTHING electrical. They gain 0.41mV per PH, so having electrical wires around them can easily change that. Just mentioning in case you've moved some wires around recently that could be causing it. It's most likely the increased O2, lots of people have summer/winter PH levels because of more windows being open.
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