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

Excellent, works well. Just don't have the means to test the accuracy

The PH & EC/PPM meters are worth their weight in GOLD. The meters come in a VERY sturdy box plus detailed separate instructions, the PH meter comes with powders for calibration and the EC meter comes calibrated plus spare batteries for both. I would recommend these, and at a very good price too.

Crazy, totally confused even after following instructions

I bought this set mainly to check the conductivity of my LC coolant in my Ioniq 5. The items arrived quickly and safely in a solid box. It came with full instructions and even an extra set of batteries. I checked the TDS meter using tap water and got an expected reading of 56 (pure distilled water would be closer to 0) us/cm. I am very pleased with the performance and the value. Highly recommended!

TDS meter are working fine but for the PH meter I personally don’t arrive to fully calibrate it as all the time I do the PH 7 then PH 4 and when it’s arrive to do PH 9 it’s return to PH 7 so impossible to complete the calibration.

Ich hab den PH-Tester bisher nicht benutzt, kann also nix dazu sagen, ob er funktioniert oder nicht. Den zweiten Tester nutze ich fleißig um die Qualität meines Wassers zu prüfen. Ob die Werte nun 100%ig genau sind oder nicht, kann ich nicht prüfen. Mir reicht es für meine Zwecke zu wissen in welchen Bereich ich mich befinde. Ich brauche keine absolut genauen Werte. Ich für meinen Teil bin zufrieden und bin gespannt wie lange die zwei Tester funktionieren.

its as expected

5 Stars — Convenient and Accurate Water Testing Kit This VIVOSUN digital pH and TDS meter kit has been a very useful addition for checking water quality and monitoring pH levels. I’ve used it for pool maintenance and general water testing, and both meters have been simple to operate and easy to read thanks to the clear digital displays. The pH meter responded quickly and gave consistent readings after calibration. I also liked having the separate TDS/EC meter included, since it makes it convenient to monitor multiple water conditions without needing additional equipment. The compact pen-style design is lightweight, portable, and easy to store between uses. Another thing I appreciated was the straightforward calibration process and the included instructions. The readings stabilized fairly quickly, and the hold function on the TDS meter is a helpful feature when testing samples in smaller containers. Overall, this kit offers good value for the price and works well for anyone needing basic digital water testing tools for pools, hydroponics, aquariums, or household use. Accurate, convenient, and easy to use.