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💧 Master your water quality like a pro — because precision is the new power.
The GuDoQi 4-in-1 Digital Water Tester delivers lab-grade precision with 0.01 pH resolution and ±2% accuracy for TDS and conductivity. Featuring automatic temperature compensation and an intuitive hold function, this compact, handheld device is engineered for seamless water quality monitoring across hydroponics, aquariums, pools, and RO systems. Its versatile, easy-to-use design empowers professionals and enthusiasts alike to maintain optimal water conditions effortlessly.








| ASIN | B07FD21D2B |
| Best Sellers Rank | 26,788 in Garden ( See Top 100 in Garden ) 7 in Water Garden & Pond Test Kits |
| Brand | GuDoQi |
| Country Of Origin | China |
| Customer Reviews | 4.2 4.2 out of 5 stars (2,874) |
| Item Weight | 50 Grams |
| Manufacturer | QBY |
| Material Type | Plastic |
| Recommended Uses For Product | Testing and monitoring water quality in pools, drinking water systems, RO systems, aquariums, spas, and hydroponics |
| UPC | 603977219989 |
A**T
Hydroponics are thriving
Got these to test the Ph and EC levels of the nutrient solution in my hydroponics systems and they are currently doing great. The product is really handy to keep the Ph and EC levels steady in my nutrient solution and the multiple readings can be taken in a row which is really handy. The Ph tester even comes with different packages of Ph buffer solution so that's really handy as well. My plants in my hydroponics system are doing great right now thanks to this product. Overall really like the product.
T**Y
Great purchase
Super fast delivery, thank you.
P**L
Quality
Great piece of kit. Comes complete with spare batteries. Excellent price and very reliable.
D**D
Qualiyy
God price ana a quality item
E**N
Not reliable and inaccurate
The Automatic Temperature Compensation doesn't work at all. Out of the box I was getting silly pH readings for my tanks and even after the painstaking re-calibration, I was still getting a pH of 8.8 for RO water at 11 degC - the water was cold as it was coming out of the tap. When I heated the water using a spare aquarium heater, the pH reading was then 7.4 at 16 deg C. Using API liquid pH test at 11 and 16 deg C, the pH was steady at around 6.5 - which is more accurate for RO water. If your tank and replacement water are both at 25 degC, perhaps this may still work for you and perhaps you may still get a pH reading that is closer to the real thing. Note also that the thermometer (built in the white tester) has a delay of a few seconds, so don't rely on your first reading.
C**E
Does what they are supposed to do
Cant go wrong for the price, easy to use and work well as far as i can tell.
M**.
Temperature sensor doesn't work
OK, so the Ph meter is pretty good, and the TDS also works fine, but as all I need for the aquarium was ph and temperature a little disappointed as I could have brought separately and saved a few quid. Shame as otherwise all good. On the plus side both have storage cases, come with batteries fitted, and spares which is a nice touch, and the instructions are clear. Tried contacting seller through questions no response to date hence poor rating
M**N
Nice
They work nicely
N**K
The devices work but what we found is that they don't work to measure the ph of tap water. It seems the local municipality adds something that confuses the ph meter. We calibrated it using the buffer solution provided and tested mineral water and it works every time. Just not tap water. The manual is also pretty bad and you have to use common sense to figure out what they really mean.
H**A
Goed werkende meetunits voir het bepalen van de pH en de verontreinigingen in het leidingwater en aquaria etc. Jammer dat de handleiding in het Engels is.
S**W
Zakupione mierniki używam w domu do kontroli wody z kranu i tej przefiltrowanej zestawem filtrów odwróconej osmozy. Mierniki nie mają znaków firmowych, jednak są bardzo dobrze wykonane a co najważniejsze precyzyjnie i powtarzalnie podają wyniki pomiarów. Teraz wiem, jaką wodę piłem do tej pory i jaką piję po przefiltrowaniu. Polecam ten zestaw. Stanisław.
L**V
2 appareils indispensables pour tester l’eau de votre spa ou de votre piscine, la calibration est impérative mais très aisée le nécessaire est fourni dans l’emballage
C**N
Acquistati per testare parametri in acquario. Sono rimasto colpito dalla precisione del phccametro , un po' meno preciso il conduttivimetro. Comunque al prezzo pagato sono veramente un affare.
Trustpilot
Hace 2 semanas
Hace 1 semana