$200 - Neptune Apex A2 with probes and EB8 energy bar. All good outlets on energy bar. Conductivity probe is a pasco 10x with a DIN connector, there's a thread on here about this.
$100 - Neptune Apex ATO ATK V2 setup + 3rd optical sensor with magnet mount and surface leak detector.
$100 - Neptune Apex ATO ATK V2 setup + 3rd optical sensor with magnet mount and surface leak detector.