Deronweer Digital PH Meter, PH Test water 0.01 PH High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium Water PH Tester Design with ATC (Yellow)

We tried troubleshooting the issues with the calibration of this meter but nothing worked. We followed the instructions and used the correct type of water. The reading are always different in each of buffer solutions. Sometimes the readings just keep rising way past what is expected. There is no way we can use this and get a correct result even if we averaged the reads, the numbers swing too much. We will be returning this meter.

Well, this brand lasted longer than any of the others. I got about two months before it wouldn’t properly calibrate. Note that this is MUCH better than any of the other brands I’ve tried, many of which failed out of the box. That said, it’s cheap and it will fail way quicker than the units I used to get a decade ago. No one seems to be making a solid pH meter anymore.

This meter will not calibrate properly, despite following the directions exactly as they were written. Also they only provided two of the three chemical calibration packets. This device does not work properly, do not buy it, or you will be very sorry. I will be immediately returning this for a full refund.

this meter works real well it has testers in it so you can keep it calibrated as needed and it comes calibrated so it can be used immediately plus it has a plastic case and the battery hold will not come out while you are holding it . by far a great tool for the price

I have returned this item. It malfunctioned within a month and the seller did not have any suggestions.

New to hydroponics and I have been using this. The first time, I ran both the meter and the regular water-test-kit pH test and they seemed to correlate. This meter is quick and as far as I can tell, seems accurate.

Excellent meter with surprising accuracy.Comes calibrated according to my long trusted phstrips, though I've yet to test the calibration kit that's included. Great buy for the price.

For a guy who minored in chemistry, I found this to be total junk and waste of my time. I followed instructions precisely using distilled water. I measured the water temperature, used separate glasses, mixing sticks and filter paper for each solution. I rinsed with distilled water and dried with separate paper between each step. Once each calibration step completes, the meter values fluctuate wildly. Value changes are too extreme to get any meaningful readings.