VIVOSUNDigital pH and TDS Meter Kits, 0.01pH High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1 TDS EC Temperature Meter for Hydroponics, Pool and Aquarium, Yellow Blue, UL Certified

I've found these to be very accurate and easy to use. So far I've used it to test our tap water, filter water, aquarium water, and spring water on our land. The ease of the devices is really top notch. I'd highly recommend to anyone interested in a quick look at true water quality.

La mejor compra que he realizado yo utilizo esto en mi embotelladora de agua me da el ph y así mismo ayuda a ver los solutos es un súper producto esto ayudó q mi embotelladora de agua pase la certificación BPm en Ecuador

This is very important to keep the water right for the plants to grow.

Its really good at doing it's job. I've had this for about 3 months and have not needed to Calibrate it yet. Trust me this is much better than getting an automated one, the accuracy is superb.

So I bought this set wanting to try out actually tracking and adjusting my pH and EC of my nutrients for my little indoor hydro-farm. Like most people, I didn't want to spend a lot on my little hobby so I figured I would give this product a try as I actually enjoyed some other Vivosun products.I'll start with the TDS/EC Meter. It is actually decent and appears to be pretty accurate right out of the box. I've used it for a little while and it remains to be acceptably accurate so far without any issues. Good to go, this one I'm pretty happy with and will continue to use at least for now.Next I'm moving on to the problem child, the pH Meter. Wow. Where do I begin. I started off trying to figure out how to calibrate this little thing as the instructions drastically varied from all the calibration videos available online for it. Maybe they changed the method but once I figured out how it wanted to be calibrated I went through the steps and all was good. I tested it a number of times using various testing liquids and it was pretty spot on (at least within acceptable limits for my hobby, not anything that needs to be precise though). So I mixed up some of my nutrient solution, cleaned the pH and TDS meters as advised to in the manual and put them away safely. Fast forward 1 week, I pull out the pH meter and dip it into a cup of distilled water and it tells me that it has a pH of 10.3! Far from the value of 7 I was expecting to see. So I pulled out my other pH balanced liquids to test and every one of them was extremely off from what it should be. It completely lost ALL calibration after one use, and one week of storage. I'm sorry but that means I need to calibrate this thing every time I turn it on? And they only supply you with one set of calibration powder that isn't to be re-used? Absolute and complete garbage. The calibration costs for a year would be well into the hundreds a year for a $10 meter! Absurd. This is a product you should definitely skip buying. Buy yourself a 14-sided dice and give it a roll, it will give you a more accurate guess on your pH level than this thing every will. I would return it, but I was not thinking and threw away the packaging already.

I love vivosun products. I have a 3x3x6 filled with all vivosun. Duct,light, fans, hydrogenator, cam, and I picked these up to ph my water. It had a weird white calcification when I opened it for the first time.

100% funcional

Great product! Wish it came with a few more packs to recalibrate instead of just one set but other then that 5 star product!