Try to open the case and try to misure pH without cover. I notice that It works. When I close the case, the pH values drift to 15.00. I think the problem is the small aluminum strip glued to the removed part of the case. You should try to take it off and see how it behaves when closed. What's the use in your opinion? I also tried to put some paper or plastic between the spring and the case, but the operation is guaranteed only if the whole is open. Let me know to you how it goes in this situation. I cannot remove the silver sticker because I am waiting for the product to be replaced.
@CiroCamardella
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I tried to remove the aluminum foil with the help of a hair dryer, so that I could put it back. When I close the case I have the same wrong behavior.
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