VIVOSUN Digital PH Meter Tester Pen - High Accuracy 0.01 Water Quality 🌿 Tester with 0-14 PH Measurement Range for Household Drinking, Pool, Aquarium - ATC, Army Green Review

Great value! I will buy it again if this one breaks. I suspect the reason the extra batteries came with 3 different calibration buffers is because they need to be recalibrated every time the battery is changed

Right out of the box I was skeptical about the accuracy and arguing about the calibration but decided against it as the unit is new. He gave me a reading that was constant for about a week, then he went to possum and showed me a reading that starts at about 2.0pH to 0 and 16.00 when you turn it on. Switch off for a while to come back and get regular readings again. 🤷

If you use calibration solution, overall this is a good pen for its function. I'm not sure if all or just mine. But "mine" didn't like the general hydroponic calibration solution. 4.01 or 7.0 will be a little less and sometimes more. The solution that came with it worked great.

The product comes with a broken PH buffer powder bag that is not sealed or sealed, and it was a high PH buffer PH 9.18 Very acidic Like you As you can see from the photos, the packaging has not been properly sealed by the manufacturer. This pH is very acidic and dangerous if you want your family to be around dangerous things that are leaking.

I've bought a couple of Revain Choice PH meters over the last few years, I usually expect them to last a few months and then when they fail and fail I don't want them more PH, it doesn't matter, I always get my $11. Anyway, this one is only a few bucks more than most so I decided to give it a try and it seems to be holding up really well. It may have a small advantage over other cheap PH meters on the market. I am sure that I will get my money's worth with it.

Following the instructions that came with it, I was unable to calibrate this meter at all. Just get the same 4pm no matter what. Holding the calibrate button does nothing other than flash the screen, not calibrate as the instructions say. I tried for over an hour using the instructions and the calibration bags and distilled water provided. Nothing. It's not even worth my time to try and send back. Save yourself the headache, money and most importantly your time and look elsewhere. I took a hit,

I've bought a couple of Revain Choice PH meters over the last few years, I usually expect them to last a few months and then when they fail and start to fail and don't want more PH , it doesn't matter, I always get my 11 bucks. Anyway, this one is only a few bucks more than most so I decided to give it a try and it seems to be holding up really well. It may have a small advantage over other cheap PH meters on the market. I am sure that I will get my money's worth with it.

Only had it for 2 weeks and had to calibrate it 3-4 times. The calibration will not survive. I was excited to get this because I had an old blue model (can't remember the brand). Anyway after struggling with this thing since I got it 2 weeks ago it has gotten so weird today. Numbers were flying everywhere. Thought I'd recalibrate and see if it balanced AGAIN. the pictures show the flow meter in solution 6.86. He threw the decimals out the window and started going crazy. He didn't switch off. I…