According to Echo company that makes hydrogen producing water bottles they state your device is inaccurate on measuring correct ppm on hydrogen levels.

bought this to make sure my outrageously expensive Hydrogen (H2) bottle (the Echo Go plus) did what it said it would do. (To produce 4.5 ppm of h2 - which it came no where close btw). This tester is easy to use and tests lots of other things for water quality. sending the bottles back but keeping this tester!

This is my 3rd Digital H2 tester - this seems very accurate for a Digital Tester - of course the best Hydrogen test is the liquid reagent drops - but this is a good quick test up to 1200ppb.

Has worked great for balancing ph. Accurate and easy to use. Would recommend

Quaility is great, worked fantastic for hydroponic setup, functional out of the box and a great value for money!

I ordered this water quality tester to confirm the water quality at my house, which I believe has been good according to the annual reports from our water agency.After opening the box, reading the instructions, and exploring the test modes, I found myself confused. My biggest problem was trying to figure out what testing mode was selected on the device. The instructions say to "Press the MODE/CAL button, adjust the tester to ORP mode." No matter how many times I cycled through all the modes, there was never any indication on the screen of an ORP mode.So, I skipped to the next instruction for TDP mode that said to, "Press the MODE/CAL button, adjust the tester to TDP mode." Again, there is nothing on any screen that shows TDP mode.The same thing with the EC mode. There is no EC mode showing on the screen at all.The only modes that show labels on the screen are the H2 mode and the pH mode. I figured out after some trial and error that you can figure out which mode you are in by looking at the symbol on the screen that shows the units of measure. For example, EC is measured in µS/cm, so the screen that shows µS/cm is the EC test mode. ORP is measured in mV, so the screen that shows mV is the ORP test mode. And finally, TDP is measured in ppm, so the screen that shows ppm (but not H2) is the TDP mode.To make it easier to use I created a cheat sheet (see photo of white page) that shows a list of the indicators that appear on the screen, then shows the corresponding test mode (e.g. TDP, EC, ORP) and a description of what those letters stand for and what is being measured in each mode.That was only half the battle. Now that I knew what each mode was for, next I had to figure out what sort of numbers were normal for safe drinking water. I spent several hours researching and compiling another cheat sheet (see photo of yellow page) that shows the expected readings for safe water from what I found. I am not an expert, so this is just my own opinion based on my research. I should mention that I could not find any consistent information on H2 readings, so I listed it as uncertain.One last instruction that was not obvious to at least one reviewer who was trying to test water samples with the watertight plastic cover still in place, you need to remove the cap from the tip of the probe before dipping it into water to perform tests. To be fair, the cap is snug, so you need to twist and pull firmly to remove it. The instructions caution users not to touch any of the delicate probes or sensors that are exposed once the cap is removed.I hope this detailed information will help make it easier for others to use this tool to perform water tests, and easier to interpret the results from those tests.Overall, this tool seems to work very well, but the lack of adequate instructions and the absence of mode labels on the device's screen prevent me from giving a 5-star rating.

The YINMIK pH TDS Meter is awesome! It’s super easy to use and gives accurate readings fast. I’ve used it for testing drinking water, beer brewing, and even my hydroponic setup, and it’s been spot-on every time. The fact that it measures six different water quality factors in one device is a huge plus. The digital display is clear, and switching between modes is simple.

This drinking water tester is easy to use. It gets the same results as another tester I have gets.