wireless pool monitoring system...has anyone ever used this?

It does look very cool. Keep in mind that ORP sensors are somewhat finicky and don't read the chlorine level directly. They also tend to fail after a year or two (or sometimes sooner if you don't handle then carefully), so you may need a new one every other year (or more). Over time the PH sensor will drift, I wonder if they make provisions for recalibration or if you just replace that as well.
 
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