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Ask the seller how old they are. The PH probe should be stored with the cap on with a bit of probe storage solution in it. The cost depends on the type of probe. The salinity one is pretty expressive but the ph and temp less so. You can look them up on bulk reef supply to see how much they are.How do we know if the probes are dry not dry? I mean if they post in sale post... how do we know about it? Are probes expensive to buy? Is probe the only factor that I need to look when buying used one?
How do we know if the probes are dry not dry? I mean if they post in sale post... how do we know about it? Are probes expensive to buy? Is probe the only factor that I need to look when buying used one?

