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Hello: I bought a pinpoint PH moniter used and am trying to calibrate it. I cannot seem to get the numbers to 7 or 10 while calibrating the unit. I have the probe in the solution and am cranking the appropriate screw to adjust the display and no matter how far I turn the screw it will not...

Hello everyone: Im Jay and I live in Vancouver Washington. I have 2 tanks 55 gallons each. I hope to learn much from everyone here as well as share what Ive learned so far if I can. Have a great day :whstlr: Jay