I don't think I've ever written a review but felt the need to warn people about this crappy topic. That's not correct at all. I have tested substances whose pH I know and the readings from these strips were the same whether I was testing an acid or a base. Ridiculous. And the fact that YOU ARE NOT ALLOWED TO RETURN THEM tells me this product is a total scam. And yes. I know what I'm doing, have followed simple instructions and have used similar test strips many times in the past. remember people This item is non-refundable. That should tell you something.
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