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  1. Yomeister66

    ORP Calibration

    Thanks for the info guys. Did some more research and apparently these probes get dirty real easy. Took it out, soaked it in vinegar for 10 minutes, cleaned it with a soft tooothbrush (not my own) and returned it to the sump. ORP reading was back to 290. But I'll order some calibration fluid from...
  2. Yomeister66

    ORP Calibration

    Does anybody know how to calibrate an ORP Probe? I'm using one on my ozone controller but I'm not sure if it's working right. When I got it about 8 weeks ago, the ORP in my tank was in the mid 200s. Red Sea recommends 300-350. I raised it slowly until it read about 335. The unit shut off...
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