- Location
- Staten Island

October 15 but I didn't put it into service till late January 2016
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A lot of guys don't realize that a PH or ORP probe degrades when it no longer can be calibrated correctly which you should get a minimum of 2 years out of standard probe. Oxygen and salinity probes are solid state and last indefinitely as long as they are maintained properly. A quick search on Reef central will give you this info on at least a dozen different posts by people who are certified in this area. Thanks for your post though.
