AERO-GRO 5-in-1 TDS/pH Meter - IP67 Waterproof, 5 Functions: pH, TDS, EC, Salinity, Temperature, 0.01 Resolution, High-Accuracy Pen-Type Tester for Hydroponics, Water, Wine, Spas, Aquariums

Works great

We purchased this meter as a replacement for an old, dedicated TDS meter that finally died. We primarily use a TDS meter to test our filtered drinking water, so we know when it is time to change the filter cartridges in our R.O. water filtration system. When the TDS is over about 40 or 50 we know it’s time to change the cartridges.Since this new meter is a 5-in-1, we now have a meter that can also test the pH of our aquarium - and we don’t even need to use the pH test strips anymore! The meter also has a nice, bright display and is easy to switch between the different modes. The “Hold” function is also really helpful when measuring pH.There are very nice printed instructions, and there’s even a QR code in the instructions that takes you right to the online video tutorials for the meter. Love that! The videos and other information on the Aero-Gro website are easy to follow and really helpful. There’s even a video on how to calibrate the meter using the included buffering powders.The meter feels well-built and is quite sturdy. It’s also waterproof - which is nice in case it gets dipped too far into the water. Very nice meter!!

So easy to use!! I love that this meter is waterproof and that it can also measure salinity. In our house we use a pH meter and TDS meter mainly to check the aquarium pH and to test our Reverse Osmosis filter efficiency. Because this meter is waterproof, I can now safely let the kids use it without worrying that they’ll drop it in the water. Great feature!We have very hard water where we live, so the TDS meter helps us monitor how our water softener and R.O. system are performing.The saline % feature is also really useful for us. We like to add just a little bit of salt to our freshwater aquarium, and this meter lets us measure exactly how much salt is in the water before we pour it into the aquarium.The how-to videos on the website are really helpful and easy to follow. There’s a scannable QR code in the instructions that will take you right to the videos. There’s even a video that shows how to calibrate the meter. It’s much easier to calibrate than I thought it would be.I’m very happy with the meter as well as the customer service!

I check my water for my grow twice a day and the Agro stays accurate for a long time. I recalibrate about every two weeks and have tested it against other meters along with other ways of testing and it’s performed very well.

One of the best looking meters you will find anywhere but note that the TDS meter is not accurate in the lower ranges around zero. It is however, very accurate in the middle ranges. For example, the water meters that come free with water filters will give you a more accurate reading than this meter in the lower ranges.