I don't need a PH tester to be very accurate just within 0.5 or so. I calibrated it with the packs and it consistently gave insane readings (like 5.2, 6.8, 4.7) from the same cup I was trying to test. I then calibrated it with the powder I had from my last one and it was still off. I was not satisfied with the PH tester. I didn't know it came with a PPM tester when I bought it. Works perfectly and will not be returned for this reason.
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