$9.96
on Amazon
Where we mention this product
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problems
Water Softener Not Working (Still Hard Water Checklist)
TDS verification · Best for: 30-second test of softener effectiveness — read TDS before and after the unit
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water
Iron in Water: What It Does, How to Test, How to Treat
Context only · Best for: Track overall dissolved solids; note it does NOT read iron directly
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water
Water Hardness Explained (gpg, ppm, How to Test)
4-in-1 digital · Best for: Modern TDS/EC/temp meter if you want a digital reading alongside strips
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