The 10 Best TDS Meters
This wiki has been updated 10 times since it was first published in November of 2018. Whether you're maintaining an aquarium, growing a hydroponic garden, or assessing the quality of a home's filtration system, one of these TDS meters will keep you well informed. Designed to measure varying concentrations of dissolved metals, minerals, and salts within liquids, they can help determine whether or not a water source is fit for general use and consumption. When users buy our independently chosen editorial recommendations, we may earn commissions to help fund the Wiki. If you'd like to contribute your own research to the Wiki, please get started by reviewing this introductory video.
February 01, 2021:
It was a fairly straightforward update, with the vast majority of our previous picks making it through the round. The only option we ended up eliminating, due to availability issues, was the NovoBlue 2-in-1, which we quickly replaced with the Gain Express 6-in-1 — a portable model that comes with a few useful extras, including a wrist strap and rigid storage case.
November 27, 2018:
Added the Soeks EcoVisor F4 for its multifunctional design and easy-to-use touchscreen interface. The HM Digital DM-1 was one of the few inline options I found that can measure both input solution and output liquids for filtration/purification systems. Also included the Bluelab Guaradian for its dedicated hydroponics applications. The backlit LCD on the HoneForest Tester is capable of flashing both red and green, making alerts easy to tell apart from one another. Finally, added the Thomas Traceable for its chemical-resistant design and large, easy-to-read digits.