ceastman Posted March 12, 2016 Share Posted March 12, 2016 so my orp probe started reading zero a long time ago, months maybe even a year. I thought I would have to order another one but I don't stare at my orp levels so it wasn't something I needed to replace right away. It just started working out of the blue on 3/9/2016. so odd. Link to comment Share on other sites More sharing options...
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