This ph pen cannot be trusted. I calibrated it and it's still off by 15-20 points or more. I put my 8 year old red Hanna pen in a 4.01 solution with this ph pen and the Hanna pen read 4.00 but this ph pen read 3.83 even after I calibrated it have. . He fluctuated greatly in various indications. Tap water to R/O water and this thing was everywhere. Cannot be used for anything important. To me, it's only good for the trash can. As for the TDS meter, I didn't even bother to test it because I wouldn't trust those products.
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