I have a APERA PH60 tester and after calibrating it, it will not hold when I test my aquarium water, the numbers go up and the smiley face appear then disappear and the numbers start going down again and that is all it does, it never stays to the point where it says hold.
Edwin Walton
I have a APERA PH60 tester and after calibrating it, it will not hold when I test my aquarium water, the numbers go up and the smiley face appear then disappear and the numbers start going down again and that is all it does, it never stays to the point where it says hold.
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