YINMIK pH EC Meter for Water Hydroponics, PPM Meter for Nutrients, Measure pH PPM Conductivity Temperature of Hydroponic Garden Water and Nutrient Solution, EC pH TDS Meter for Water, Aquarium, Pool

Works well easy to calibrate.. Nice to have a continuous ready handy on your phone.

Great product worked as expected and advertise. It has been a year now and it still works like it did brand new. I didn’t even have to calibrate it.

This is phenomenal! I have a 55 gal drum attached to 12 bucket sites for an ebb and flow system. This is amazing to just toss in the barrel! I will say you have to almost mount the prob in a way that makes in "dangle" in the water. I found if it its the side of the barrel or especially if the prob makes contact with the bottom it will throw off the numbers. I will add a video because I can throw a tiny PH down/PH up in the barrel and you can see it start to change the PH number in the tuya app! Seriously amazing product, I can monitor my hydroponic system from anywhere! Seeing how responsive this is, I would trust for an aquarium tank

I would not recommend this pen to anyone. I calibrated this pen along side my Apera. This was off significantly, to the extent it is worthless. Good luck with customer support from China. Just buy a decent pen from Bluelab, Apera, or even Vivosun.

Love this meter. I use this meter daily for several hydroponic systems and the readings are always accurate. The battery life is great and I've needed to change them once in I don't know how many months now. Assuming you have good batteries, the meter is very bright which is nice under a full canopy. It seems to be good quality and doesn't feel flimsy in your hand. There is a little loop at the top to add a lanyard of some sort if thats your speed. I use this to fit the meter down into deeper reservoirs. The meter and screen are a good size for measurement and visibility.

Update May 20, 2026. The temperature probe stopped working correctly I contacted customer support and they sent a replacement immediately. Been running this for about a month now calibration is holding well and love to be able to check my temp pH and EC from my phone

Another Update: I reached out and they sent a replacement for it right away. Great customer service! UPDATE AFTER 2 MONTHS: had to knock this down to two stars after the pH sensor bulb decided to fall out and then broke, rendering it useless. I'm outside the return window and will have to order another sensor. Worked great up until its self destruction. I'll be reaching out to YINMIK to see what kind of support they can offer. ORIGINAL REVIEW: I've been using this thing everyday for about 3 weeks for a hydroponic grow of veggies and leafy greens. I calibrated it when it arrived and again last night. it had only drifted about .04 which is negligible so it seem to be holding its calibration (for an admittedly short test run). I find that if you are moving from one solution to another and they are different temperatures, it takes extra time to get a stable reading. just be patient.

It worked great until it did not. It will not calibrate anymore, so it is useless. I tried to email the manufacturer as I could not find a phone number, but I have not received a response. Update** 04.01, as soon as the manufacturer seen my review they reach out to me. The got on the case lightening fast. They sent me a new tester and I already have it. The customer Servcice was great.

Though I never tried the super high end EC meters for 4x this guy's price, it's super accurate and has been since I bought it a few months back. I tested it against 2 different name brand drops. Just take care of it and rinse it off with distilled water every time you use it and don't smash it around like a toy and nothing will break or malfunction. Love it.

excellent unit, works must better than my other meter. Easy set up.

It went on and a few moments later it went off for good. It had a us plug i used a universal adapter. Should have been fine. It was faulty. The refund return was,very easy thanks to amazon so I'm happy with that

This water meter is very easy to use, I like the backlit screen which makes measurements a breeze to read. It's well constructed and appears quite accurate based on test solutions. The only downside I see with this meter is that the pH levels take some efforts to get right. Just dipping the meter in water is not enough, the meter will stabilize on an abnormally low pH. I have to move the meter in the water left/right/up/down for a good 10 seconds before I start getting a sensible reading. If I don't do that, the meter will stabilize and report about 1 pH lower than the real water's pH, which is significant. I still would recommend this meter as long as it's clear that it must be wiggled around in the water quite a bit to get an accurate pH reading.

Great Ph meter