pH Meter from TFTestKits


Active member
Jun 2, 2019
Mansfield, TX
I bought the pH meter from TFTestKits and calibrated it, checked it against the drop test and it seemed pretty spot on. Over a few weeks it drifted away from the drop test (couldn’t help myself, kept checking the two against each other to make sure) and now I don’t trust it.

What are others’ experience - should it need to be calibrated after just a few weeks of use? I don’t feel like blowing $6 regularly on a junk device...

I read quite a few posts on here that seem to indicate it’s not a great device.


Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
pH meters drift and calibration needs to be checked every week or two. The TFT yellow meter especially gets off if you accidentally leave it on for a period of time. More expensive meters have an auto power off to not weaken the battery. You need to get pH 7.0 calibrating solution to regularly check it.
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