$13.97
on Amazon
Where we mention this product
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essentials
Hardness Test Kits and Strips: What to Buy
Alt digital · Best for: Alternative TDS meter that also measures conductivity and temperature — same softener-verification role as HM Digital
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essentials
RO Filter Replacement Schedule: How Often to Change Filters
Mid-range TDS · Best for: More accurate TDS reading for tight replacement timing on multi-stage RO.
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start
Hard Water vs Soft Water: What Actually Changes
Digital option · Best for: Get a precise TDS number instead of color-matching strips
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