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pH testing pen?


Karen B.
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Greetings 

I am a bit of a lazy tester which is why I love aquarium coop test strip. However, for some reason, it doesn’t read the pH (probably because it’s canadian water! 🤣😂).

So I am looking for a pH testing pen that I could use to test the pH on my aquariums. Do you have suggestions. 
 

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