TDS Meter Digital Water Tester, INKBIRD Professional Electronic 3-in-1 TDS, Temperature and EC Meter, 0-4995ppm, Ideal ppm Meter for Drinking Water, Aquariums, and More Lab Viscometers(White)

Skip the cheap TDS meters and get this. I use mine a lot in my shrimp tanks to help me keeping the TDS stable. When my cheapo meter stopped working, I got this. I love the backlit screen and the solid feel. While I cannot say how accurate the TDS measurement is (it's at least similar to my older meter), it measures temperatures accurately. Here, I set my aquarium heater to 25C to heat up 5G of water, and then compared the temperature measurement with my very accurate Fluke DMV readout. Same temperature. I also like that I can use AAA batteries.Just like other users, I had to learn which cap is for the probes and which for the batteries, and just like others, I am clueless as to why I have to press the on-button for several seconds before the display turns on. Other than that, this is a great meter, and I recommend it.

I don't have anything to test this against, but it seems reasonably accurate and it settles to a solid reading quickly. iIlike it better than the more expensive one it replaced.

I like this little tester. I have checked home water, water friends bring to me, and work water. it seems to be accurate also..

Don't really have much to compare to. I am a bit concerned because right out of the box I was getting some erratic readings. It seems like it either measures one set or another of values. I was initially getting 50ppm from the tap and 2ppm for our RO.Then 5 minutes later it reads 100ppm from the tap and 4-6 from the RO. Last time I checked it was 100/5 again. I don't think the water quality has changed.Either way it is doing its job of verifying the RO system is working correctly, but I'm not sure that I really trust it to be very accurate.It honestly might be the best one in Amazon considering the others can be even more unreliable and at least I can change the batteries in this one.

Good

Bought some testing fluid by Blue lab and this thing was off by 0550 which is a lot. Without a way to calibrate there is no way to fix that(figured out how on my own, posted below). I used test fluid to find out it is off.Revised: On the up side I figured out if you press the "hold" and "shift" buttons at the same time you can recalibrate it. Mine needed to be at 122 to read correctly. The us/cm needs to be flash for this to work and on EC mode. Picture included is in calibration modeI'm sticking with the one star because the company that sold this and everybody else would not help me and after failing to return it I decided to figure out if I'm able to take it apart and fix it which is when I was able to find out how to recalibrate it the company would not tell me how to recalibrate it or respond to emails. I had to figure it out on my own I'm sticking with the one star. You should not have to buy an item get no customer service help and literally figure out how to do everything on your own to make the item work. The instructions also failed to tell you how to recalibrate.

When it comes to measuring and controlling my indoor garden's environment Inkbird is the brand that I trust the most for accuracy, value, quality and endurance. I just purchased a Hypochlorous Acid Generator which requires an accurate ppm meter to achieve the proper ratios - I have a ver expensive TDS meter but I wanted to dedicate a meter strictly for this purpose as I will be making a lot of his solution - When Inkbird came out with this meter I decided to buy it and test it against my expensive meter - The accuracy was exactly the same. This meter is easy to use and read - it is perfect - I have done business with this compny before and their customer service goes above and beyond - I highly recommend this product and company A++++ all-the-way.

Had Several, This Is Simple To Use, 100% Accurate, Can't Say More, Save Your Money And Buy This One.And Always Read Reviews Before Buying Anything.Good Luck