$35.55
on Amazon
Where we mention this product
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essentials
Hardness Test Kits and Strips: What to Buy
Most accurate · Best for: Industry-standard drop-count titration — ±0.5 gpg accuracy for borderline cases and professional use
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water
Water Hardness Explained (gpg, ppm, How to Test)
Pro accuracy · Best for: Drop-count titration for precise gpg when sizing a softener
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