VIVOSUN Digital 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
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FREE refund/replacement until Jan 31, 2026 Learn more
FREE refund/replacement until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026
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Availability:
In Stock.
Arrives
Sunday, Dec 7
Color: Yellow+Blue
Features
- Application: Great for all home and laboratory TDS & pH testing applications including aquariums, swimming pools
- PH Meter: Full measurement range of pH 0 - 14, reliable and quick readings
- 3-in-1 TDS Meter: Measurement Range 0-9990ppm, 0-9990s/cm; Accuracy 2%, 0.1- 80.0C, 32.0-176.0F; Note: This meter can't test sea water
- Features: Comes with protective case; Lightweight, handheld design for portability and convenience
- Included: PH meter, 3-in-1 TDS meter, 3 calibration buffers
Brand: VIVOSUN
Manufacturer: VIVOSUN
UPC:
Material: Plastic
Is Discontinued By Manufacturer : No
Package Dimensions : 6.97 x 3.9 x 1.26 inches; 3.53 ounces
Item model number : 4336465266
Date First Available : March 14, 2017
Manufacturer : VIVOSUN
Best Sellers Rank: #475 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #1 in Lab pH Meters
#1 in Lab pH Meters:
Customer Reviews: 4.0 4.0 out of 5 stars 31,767 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Dec 7
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: Yellow
Received on July 23rd 2025. This is lightweight, user friendly and easy to calibrate. It came with extra batteries and 3 packets of pH Buffer Powder. The design is simple, nothing unnecessary. However, it takes a minute or so to get a reading. Much slower than I would like but for the price you can't exactly complain wholeheartedly. I am slightly worried about the standing quality after some time. I'll update my review with the quality, how long it works, the batteries life, and if anything changes.
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Reviewed in the United States on July 23, 2025 by Christine Jones Christine Jones
Color: Yellow
This is the second of these PH meters I've purchased. There are a number of negative reviews, so I was a little concerned but went ahead and order one. The first meter calibrated easily and (apparently) accurately. I used the three point calibration, then tested my fish tanks and compared the reading to the drop type ph test kit I had been using. It was spot on as close as I could tell with the test kit. I used the meter for a week, every day on several tanks as I changed the ph. It tracked these changes as I would have expected it to. It worked very well for me so I ordered a second PH meter. (I have fish tanks in two locations.) I then used these two meters side by side. They vary from each other by 0.10 points. The second meter did not calibrate as easily as the first, and the calibration was off slightly. I will try recalibrating, but it's as accurate as I need now. I'm very satisficed with them and would recommend.
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Reviewed in the United States on April 12, 2024 by LarryFormPak
Color: Yellow+Blue
The TDS meter works very well, especially considering the low price — it gives quick and reliable readings. However, the pH meter takes a bit longer to stabilize and provide an accurate measurement. Overall, it’s a useful and affordable kit for basic water quality testing, but be patient with the pH readings.
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Reviewed in the United States on October 25, 2025 by Danny Casallas
Color: Yellow+Blue
Vivosun Digital pH and TDS Meter receive a 5-star rating because of the customer service, and the products. The pH meter was not working when we received it. I contacted Vivosun and they offered a refund or replacement. I went with the replacement and received a new pH meter the next day. Both meters are working, now I just need to adjust the pH in the water I am giving my herbs so we can all be happy.
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Reviewed in the United States on July 28, 2025 by Rob
Color: Yellow+Blue
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.
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Reviewed in the United States on December 18, 2023 by Comatose
Color: Black+White
I normally love vivosun products I have two of their tents. Their fans are pretty good. The only problem I have with this kit is that the calibration points don't match my other pH meter. So I have to use the packets. I like using lab calibrating fluid not the packets. They are crap. I don't want to order more packets when I can just order calibration fluid from a lab. Other than that, the product works fine. If you're fine with the packets, they are accurate. And of good quality.
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Reviewed in the United States on October 23, 2025 by Kyle
Color: Black
I can honestly say this little pH meter (black Vivosun) has exceeded my expectations. For such a low price point, I figured there would be considerable issues with sensor drift requiring constant calibrations however this little guy has always been within .1 pH when checking prior to the calibrations I have periodically performed over the last few months. Proper rinsing and storage as well as frequency of use are also important factors when maintaining accuracy with a pH meter however the quality of the sensor is also part of the equation. With that being said, this Vivosun pH meter appears to be well made. I would always recommend periodic calibration of a pH meter if you are relying on its accuracy regardless of the manufacturer. The probe is easy to use and easy to rinse after use eliminating any hassles and the removable probe cover provides protection during storage. The readings quickly stabilize which has also streamlined my testing process. Overall, this has been a great value and I would recommend especially if on a budget.
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Reviewed in the United States on July 20, 2025 by B4UC2Far
Color: Yellow+Blue
Just make sure to calibrate ur ph meter and both of these are spot on!
Reviewed in the United States on November 22, 2025 by Zach t