2024 All-New pH Meter for Water - High Accuracy Digital pH Tester (0.01 Precision) with UL Certification and 3 pH Calibration Powders - Ideal for Home Water, Hydroponics, Aquariums, Pools, and More

Works great, and obviously this isn't an NIST traceable lab instrument or anything, but for the price, I'm impressed. It's basically the same thing anyway. I used the calibration salts, and it was already spot on out of the box, but the only way to know that is to do the calibration. Additional calibration salts packets are available on Amazon. For those complaining that it drifts, or that it changes measurement when you move it, that's NORMAL. pH is finicky, and actually very hard to nail down and measure, so if the pH looks like it's drifting, that's because it is. Moving your solution to a new container will swing the pH as well. In a lab setting, you would calibrate every day and preferably right before measuring, maybe even after too just to be sure, and take the sample to the meter as soon as possible with minimal manipulation. The nice thing about this is I can put it directly in my tank and get a very accurate reading. For a fish tank, it's pretty good.

Completely useless. This item was the worse item I've ordered this year so far. The meter errors out at each time I try calibrating no matter what ph samples I use for the calibration. 3 failed attempts using various methods to calibrate as it just keeps erroring out. Wish I could return but it's been over the month mark, great as a paperweight. Thats the only thing it's good for.

Why did you pick this product vs others?:There are several different PH meters but this one for the price is the best bang for your buck. The screen is very easy to read and the instruction manual and packets provided for calibration are straight forward. If you are not much of a reader and like to watch videos there are several online you can find to help calibrate the unit. If you are looking for a simple entry level way to get the PH I would suggest buying this one. Value for money:This little meter is super easy to use and has always calibrated correctly.

The instructors to use are really simple. I was able to easily test the ph in my pool. But the calibration instructions look complex.

Saved our fish. City had been flushing pipes with citric acid when we did a water change. Aquarium was at Ph 4.0. Or put another way our fish were swimming in vinegar.

Just got delivered and suspect our water was acidic. Faucet water is 6.7 from averaging readings as it changes every second and doesn't just stop on a #. Filtered fridge water is 6.3, again guessing. I wish it just finalized a number. Swirling it causes numbers to change but just resting it in the cup does the same. I like the digital readout. And directions for calibrating when needed altho lengthy I hope makes sense when the time comes. Giving it 3 stars due to the inconsistency of readout and guessing where it actually is.

The calibration was spot on right out of the box. I tested it against a reliable drop testing kit and it matched up perfectly. I hope it stays that way, but so far so good.

I bought this item on amazon Jan 17th and received it a few days later. Following the calibration instructions, the ph meter would not calibrate. I exchanged it with Amazon for a new one. Received it a few days later and this one would not calibrate either. I called Vivosun and waited 4 hours for them to call me back. The caller hung up before my wife could get me on the phone. I called them back and waited about 10 minutes to speak to another person, who stated that the meter comes fully calibrated from the manufacturer and if I was having trouble with it, I needed to buy another solution to calibrate the meter. I asked him if they could replace it and he took my email information and said it would take about 24 hours for me to get the email and someone would help me at that point. I asked to speak to his supervisor, I was placed on hold for about 5 minutes, he came back on the line and told me that his supervisor was unavailable and I would have to wait for the email. I have spent 100s of dollars with this company and this is the best they can do? I highly recommend others picked a different ph meter do to the faulty state of this device and the companies customer service just sucks.