VIVOSUN Digital pH Meter TDS EC Meter for Water 0.01 Accuracy Hydroponics | ±0.01 pH Accuracy, ATC, Auto Calibration, LCD Display, Hold Function, for Hydroponics Aquarium Pool Drinking, UL Certified

After reading several reviews on this and other similar models I decided on this two pack PH and TDS. I recently installed a reverse osmosis under kitchen sink with a tds digital display and wanted another way to check its accuracy along with what ph the RO water was putting out. Item arrived quickly and after reading instructions I decided to give it a test. Batteries were already installed and additional batteries were included so that and they both were already calibrated so two pluses from the start. I filled a glass with reverse osmosis water and another from bathroom sink. Tds for bathroom were 107 compared to RO water of 9. This is the same reading my RO system shows so I assume its pretty accurate. Next I tested the PH. Ro water was higher than bath sink water but this units numbers jumped around a bit. Although the numbers did not display steadily i was able to get a good reading and am pleased with the results. For the price I find the two units a great bargain and much better than the water test strips I was using. After my initial tests I highly recommend these products as they appear to be accurate and easy to read.

If you’re looking for an affordable way to check pH, TDS, and EC without spending a lot of money, this is a great option. It gives you several useful readings in one device and is much more convenient than buying separate meters.The readings have been consistent for what I need, and the auto-calibration and temperature compensation make it easy to get started without a lot of messing around. The display is easy to read, and having the hold function is a nice bonus.For the price, I really don’t think you need to spend more unless you have a specific reason to buy a higher-end professional meter. This one gives you the important functions at a fraction of the cost.Definitely one of those purchases where you get a lot for your money.

notice a white fungus on that back of the yellow ph tester weird and disgusting

Great value for the money, I have owned a few of these and this one is definitely accurate and built well. It comes with a TDS meter as well, this is less important for me but it is nice to have. I like the size and the fact that it adjusts for the water temperature. It has a nice backlight that works great, just don't dip this thing too far into the water. Super easy to use though. The calibration at first takes a little bit of time but once you get through that, using it as a breeze. Setup should only take about 5 minutes, make sure you have distilled water when you start though.

The pH meter ended up being basically useless. I carefully followed all instructions. It took a lot of time and frustration to successfully 3-point calibrate it. After calibration it seemed to be partially accurate but it would take 2+ minutes to provide a reading. Even then, it would start about 2 points above the real reading then slowly keep drifting downwards at a rate of roughly 0.01 per 1-2 seconds. It would never “land” at a reading. After a week of use I gave up on it and just went back to using chemical pH tests because those only take a fraction of the time to get a ballpark reading.The TDS meter was a little better. As I said before I followed all instructions carefully regarding usage and proper storage. For the first month of regular usage (used 1-3 times per week) it worked great and exactly as expected. Then the temperature readings became unreliable. I have other digital thermometers to compare it to and this device was consistently off by about 5-10 degrees fahrenheit which made it useless at that point.The TDS portion of the blue meter seemed to be accurate and mostly worked until the end of the 2nd month. Then it would randomly behave strange. I would test the same sample of water 3+ times over 10 minutes and the ppm reading would fluctuate by 10-40 ppm. Or sometimes I would test two samples of water from my fish tank taken about 24 hours apart. It would read out exactly the same as if the meter was “frozen”. I know that isn’t accurate as the 2nd sample would be taken 24 hours later after a fish feeding and a plant fertilizer dosing. So it’s highly unlikely that it would give an identical reading for the 2nd sample.

I purchased this set to monitor my hydroponic solution strength and pH. The EC meter just stopped working after moderate use after one year. I also didn't like having to switch from PPM to EC every time I turned it on. I also noticed the readings were different when I switched from C to F. I think the pH meter is accurate enough for my needs. I calibrated it once a year and it didn't veer to far off. I mean the price is reasonable enough that I can buy a new set, but I shouldn't have to.

Are these things cheap. Of course they are. Are the accurate? Yes. Are they laboratory accurate where .001% is required? Not even close. .1 close enough? These will be OK. They are easy to calibrate and hold the calibration. I bought some other more expensive PH meters and they were not as good as these. I bought some extra calibration powder to check and calibrate and they hold the calibration a while. I use them for boiler water and they are fine for that.

THE BEST!!!!!!!I have used VIVOSUN FOR MANY YEARS!GREAT ACCURATE GUAGES. ALL THEIR PRODUCTS ARE TOP QUALITY AND THE LOWEST PRICES FOR STUFF THAT IS FABULOUS,…….

Really useful, I think the price is spot on and they have helped remove some of the guess work when it comes to pH and ppm

Great product

TDS meter are working fine but for the PH meter I personally don’t arrive to fully calibrate it as all the time I do the PH 7 then PH 4 and when it’s arrive to do PH 9 it’s return to PH 7 so impossible to complete the calibration.

Muy buenos

Hatte schon einige ph Messgeräte aber dieser tut was er soll…daher top empfehlung👌🏼