I have 2 American Marine Pinpoint monitors, one on my reef tank and one for my calcium reactor. The monitors work well and are easy to calibrate.
I question whether anyone really needs a pH monitor on a reef tank. If you are measuring your Alk and your Alk is high enough, your pH should automatically be OK. I have come to the conclusion that my fish and corals don't care what the pH is and I focus on Alk, not pH.
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120 gallon sps/anemones/LPS reef since 2004
Apex controller
8 x 54 watt T5 PowerModule
Herbie's silent overflow system
Jebao DC 12000 return pump
Jecod CP-40 Cross-flow circulation device
Mini Bubble King 180
Barr Aquatics calcium reactor
Bucket fuge
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