PH Meter, Digital 4 in 1 PH EC TDS Temp Meter for Water Hydroponics

No complains, works very well.

I have a nice sized home hydroponic garden. It keeps me busy testing nutrients and staying in my scheduled nutrient changes. I’m 81 years old and have soil gardens my whole adult life. I’ve wanted to try hydroponics so this last winter I started a Dutch bucket garden. Main idea was to get a head start on moving it outside in sunlight in May. All has gone well but the necessary maintenance of the nutrients PH and EC and the two week change outs have kept me busier than I’d expected. I’ve purchased several different meters to gauge these levels only to be disappointed by the amount of time it was taking and the variety of results. Then I found YINMIK PH Meter, Digital 4 in 1 PH EC TDS Temp Meter for Water Hydroponics. This is the finest, easiest, most accurate meter of all that I have purchased. DONT waste your money on the others, buy this one, it is awesome, you won’t be disappointed, I wasn’t. Happy gardening…

I have had to replace it already it went out of calibration & won't recalibrate again. I tried the recalibrate powder but it wouldn't do the 4.o cal. Did 7,&10.so i looked for a replacement prob tip but what I found was only $5.00 cheaper than a new meter so I purchased a new meter! Meter is fine when it's working right.

Works very well its accurate and easy to celebrate. No problems

I’m actually surprised at how well this ph meter works. I owned for 6 months now and started to have doubts about its accuracy. I purchased a more expensive $85 meter and after calibrating it I tested both meters in water.To my surprise Both came out with the same reading. I have only calibrated this meter once when I first got it. Very nice to see a $20 meter holds up to a much more expensive one. This only complaint I have about this meter is lack of the backlight staying on while I measure the water. For the price this is an extremely well made meter that holds calibration well over time. I would definitely recommend this meter

I have extensive experience using PH meters by Hanna and Milwaukee in the garden and in hydroponic applications. Those brands work extremely well and once calibrated, they remain accurate for more than a week, with little deviation. I routinely calibrate them every 4-7 days depending on use. I trust them implicitly. So, fast forward to my first current-powered Swimex Lap Pool. Due to the requirement for several different water chemistry variables to be monitored regularly, I initially used a chemical test kit that uses drops that react to water samples and produces a color that is compared to a scale. These are tedious and marginally inaccurate (especially for free chlorine and total chlorine). Since they require chemicals in droppers, kits must be repurchased as supplies are used up. Next, I tried strips, which I found more effective, but they also require replenishment over time. While shopping, I came across this YINMIK electronic water test meter. Electronic meters have worked terrific in other applications so, I decided (with help from reviews) to purchase the unit in hopes it would deliver accuracy without requiring chemical supplies or media. No disrespect to other reviewers that claim reliable results with this wand, but I found this item to be useless and extremely inaccurate. I never had the opportunity to really verify salt, chlorine and other values because the most basic feature, PH, was completely UNRELIABLE. All other chemistry that can be tested with this wand are predicated on PH and, thus, unreliable PH makes all other readings suspect. When I recieved the meter, I calibrated it using the included 4.0, 7.0 and 10.0 benchmark PH solutions. I also rinsed and dried the probe, between each calibration point, using distilled and deionised water which experience has proven to be a stable cleaning solution, unlikely to cause unwanted probe reactions or migrate the scale. With calibration complete, I began sampling the pool. Ahead of use, it was already known water was slightly acidic -a need to balance PH up. Meter displayed a reasonable result and PH-up was added to adjust. After water circulation for an hour, another test was made which showed minimal increase and further adjustment was made. This was repeated 5 times over 5 hours. After the fifth test, I began to wonder about accuracy. Water PH had increased only .3 units while PH-up directions suggested water should now be about 7.4 for the quantity of chemical introduced per pool volume. I became suspicious. Originally at 6.7, water PH had only risen to 7.0-7.1 value. I then checked PH using the chemical drop test kit. When I compared the colored sample to the scale, it read 7.4. I was out of strips and immediately drove to Ace for a supply. Further cross-checking with strips, I found PH to be 7.4-7.5, rather than the probe’s 7.1 reading. I went back and recalibrated the wand, as before. Pool was then checked and reading found to be 7.0-7.1 PH. It remained incorrect even after a second calibration. Next, I calibrated it again. Each calibration point registered spot-on with each solution during the calibration function. After using the 10.0 reference solution for the third point, completing calibration, I then rinsed and dried probe. I then inserted probe in the 7.0 reference solution and took a reading. It should read 7.0 PH. It displayed 6.8 PH!!! I repeated this experiment 3x: full 3 point calibration with probe rinse/dry between each calibration point and finally cross-checking by reading the 7.0 reference solution. Every single time the meter read 6.8 PH. This item is not accurate or reliable and is not recommended for use. I boxed the item and performed an Amazon return. Do not buy this. If I had followed it blindly, I would have ended with a pool now adjusted to a more alkaline PH, without knowing, resulting in further inaccuracy when chlorine readings would be taken. The potential of upending your pool or hot tob chemistry by using this item is all that is guaranteed. The foundation for virtually all water chemistry values is PH. The fact that this unit cannot accurately read PH makes it useless for any water monitoring.

Ok let me start by saying I was skeptical. So skeptical I bought a bluelab which is $100 + pen (which I initially didn't want to purchase, but did) Now yinmk says out of the box it's pre calibrated. It was off from factory so I would suggest calibrating when you get it! Now I calibrated my blue labs because both read 1.0 off which is a huge difference a make or break when it comes to a grow. After calibrating the blue lab in bluelab solution I retested side by and the yinmik was .30 off which wasn't terrible but also not properly calibrated. I also tested in 7.0 solution, and 4.0 solution and yes .30 off in both solutions. So I calibrated in 7.0 and 4.0 and then went side by side and both seem to read exactly the same now. The provide a powder mix solution but I'd buy a better grade liquid solution to calibrate with. Blue labs gives a checkmark when you're calibrated and checkmark leaves when it's time to recalibrate. I've only used for 2 weeks so far its very good for the price. Pros to the yinmk 1. Extra batteries 2. Calibration Solution powders 3. Feels good quality/probe looks good too 4. Easy to use and can compare to a big dollar ph pen. Cons. 1. Claims calibrated but off 2. It's a little over worked, bottom unscrews, top unscrews, just more to not have properly positioned right. 3. It doesn't tell you that it's calibrated or when to re calibrate like a bluelab. Update: broke, water got inside somehow and stopped reading ph.

Easy to Calibrate

I have no complaints about this, it works perfectly every time. I love all the different readings it gives even though I only bought it for the pH. The moisture meter is great too.

rapide et ^précis

Followed instructions exactly. Tried 20 times. You’re supposed to turn on unit, place it in 7 ph calibration solution, let it settle and then hold cal button for 5 seconds. That’s supposed to enter calibration mode. Tried holding everywhere from 2 seconds to 30 seconds. No matter what it won’t calibrate making it useless. Unless the seller can fix this I’ll be sending it back. Waste of money and most importantly time.

Honestly, if you're on a tight budget, it's PH meter as s*** garbage and drifts, it doesn't go back to calibration, like your dip in a calibration solution.What is the 7.7?And then it reads it out at a f****** 7.1, like.Honestly, this s***'s garbage do not buy it.It's from china china china disclo