VIVOSUN Digital pH Meter TDS EC Meter for Water 0.01 Accuracy Hydroponics

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.

This product works as advertised. You have to calibrate it first using the provided ph packets but once you do that it is good to go and offers accurate reading. This product assembly and price range makes for a nice introductory ph meter as opposed to a more premium, and also costly, assembly, yet it is still so much better than a manual ph test strip. I would recommend this product to anyone looking for an affordable digital oh tester. I like the vivosun brand and the products they have offered so far.

Item Reviewed: VIVOSUN Digital pH Meter, 0.01pH High Accuracy Pen Type pH Tester for Hydroponics, Household Drinking, Pool and Aquarium, Yellow, UL Certified ℹ️ Summary I picked this up for pH balancing water that I use for my indoor grow tent and it has worked great for that purpose. For $10 at time of order, you’re getting a meter from a reputable brand that won’t break the bank and does exactly what it’s supposed to do. Included in the package are a nice plastic storage case, extra batteries, and a set of pH calibration buffer powders (6.86, 4.00, and 9.18), which was a nice touch. Calibration was quick and easy and I’ve only needed to recalibrate about once every 3-4 weeks. Readings also seem accurate and consistent. My only real complaint is the build quality. It definitely feels made from cheap plastic and while the buttons are clicky, they still feel a little flimsy. Overall though, I’m happy with this purchase and can comfortably recommend it as long as your expectations match the price point. ✅ What I Like - Low-priced. - Gets the job done. - Comes with a decent plastic storage case. - Includes pH calibration buffers (6.86, 4.00, and 9.18). - Comes with an extra set of batteries. - Readings seem accurate and consistent. - Calibration process is simple. ❌ What Could be Better - Build quality could be better. - Feels made from cheap plastic. - Buttons feel a little flimsy despite being clicky. Final Verdict | ⭐️⭐️⭐️⭐️☆ Here is how I rate items: 5 ⭐️ = Completely exceeds expectations. 4 ⭐️ = Works well with minor concerns. 3 ⭐️ = Does the job, nothing special. 2 ⭐️ = Some things work, but lots of issues. 1 ⭐️ = Didn’t work well, not worth it.

I have a scientific grade PH probe that has been in continual use on a 65 gallon discus tank for 6 months and it was time to recalibrate as part of routine maintenance. After 6 months of use, probe had barely drifted. I used PH 4.0 and PH 7.0 calibration fluids. Probe was spot on with the 4.0 and read 7.1 with the 7.0 so it only needed a very minor adjustment to bring it back into perfect calibration. I used this probe as a comparison with the VIVOSUN. The VIVOSUN readings straight out of the box were pretty far off. Measuring the PH 7.0 solution, the VIVOSUN reported 7.6. Measuring the PH 4.0 solution, VIVOSUN reported 3.65. I calibrated the VIVOSUN using the provided powder for all 3 PH solutions provided as this should provide the most accurate readings per the instructions. Immediately after calibration, I poured fresh 4.0 and 7.0 solutions and the VIVOSUN results were at least .5 off in both directions. Poured fresh solution AGAIN (after rinsing probe in RO water) and once again results were way off (but different from the results it just reported from the first fresh solution pour. I then compared with test strips and the test strips matched the results from my scientific probe. In short, do not rely on the pH meter and I would go so far as to say you need to throw it in the trash ASAP. The TDS meter is also flawed. There are 4 modes of display, according to the instructions whichever mode you choose will remain the default until you change it.. (e.g. Power it off today and tomorrow when you power it on, it should default to the mode it was in when it was powered off.). It does not do this. Not only that but in the middle of taking a reading, it will just randomly switch from measuring PPM to EC or from Celsius to Fahrenheit. I don't have anyway to validate the EC or PPM readings but judging by what I can validate, I would not trust it in any way, shape or form.

They work perfectly.

This pH pen is a major upgrade over messy test strips and is super convenient for quick, digital readings. The pocket-sized design and backlit display are great features for hobbyists or light use. ​That said, manage your expectations: ​Calibration is essential: You need to calibrate it regularly to keep the readings accurate. ​Build quality: It feels lightweight and basic, so it's probably best for light duty rather than rough, heavy-duty work. ​It gets the job done for the price, but it isn't professional-grade equipment. It's a solid, budget-friendly tool as long as you keep up with the maintenance.

These things work great for my hydroponic set up!! Shipped fast!!

I recently picked up the **VIVOSUN Digital pH and TDS Meter Kit** and it has quickly become an essential tool in my plant care and hydroponics setup. The **0.01 pH high accuracy** pen-type meter is impressively precise and easy to calibrate. It gives consistent, reliable readings every time I test my nutrient solution or water. The TDS meter is equally solid, with a ±2% readability that helps me monitor nutrient strength accurately. Having both tools in one kit is super convenient — no need to buy them separately. The pens are lightweight, have clear digital displays, and come with everything you need to get started (including calibration buffers for the pH meter). Build quality feels good for the price. The pH probe is responsive, and both meters turn on and shut off automatically to save battery life. They’re compact enough to store neatly and travel well if needed. Since using this kit, I’ve been able to dial in my nutrient mixes much better, which has led to noticeably healthier plant growth and fewer issues with lockout or burn. It’s also great for aquarium owners, pool/spa testing, or anyone who needs precise pH and TDS measurements. If you’re looking for an affordable yet high-accuracy **digital pH and TDS meter kit**, the VIVOSUN combo delivers excellent performance and value. Easy to use and dependable — highly recommended!

La calibration est simple. Par contre, par rapport à une sonde témoin, il est extrêmement lent. Il faut compter presque 10 minutes pour que le pH final soit affiché. Il faut donc le mettre longtemps pour à avoir le bon pH. Après 6 mois et une utilisation par mois, il deconne complètement. Mauvaise qualité

Macht seine Aufgabe gut.

Arrived not working, tried replacing the battery but no joy so sourced an alternative

Great product

Product is good and accurate,it is giving correct ph and also very easy and safe to use .