$14.50
on Amazon
Where we mention this product
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essentials
Hardness Test Kits and Strips: What to Buy
Softener check · Best for: Post-softener verification — measures TDS to confirm ion exchange is working. NOT for initial hardness measurement
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systems
How to Remove Salt from Softened Water: 4 Options
Prove the change · Best for: Comparing one glass of softened water with one glass of RO water. It confirms a system is rejecting — it does not measure sodium
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water
TDS in Water Explained: What It Is & How to Test (2026)
Start here · Best for: Quick TDS reading before you buy any system; industry-standard installer pen
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water
Water Hardness Explained (gpg, ppm, How to Test)
Digital proxy · Best for: TDS reference reading — not a direct hardness test, but useful as a quick check
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