Category
Test kits
16 products — ordered by how often we mention them.
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VARIFY Water Hardness Test Kit (0-425 ppm, 150 Strips)
Default pick for first-time testers sizing a softener — 150 strips, 0–425 ppm range, under $10 · Know your gpg before you buy any system
$9.99
in 12 guides
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JNW Direct Water Hardness Test Strips - 150 Strips Kit
Same specs as VARIFY (150 strips, 0–425 ppm) if you want a second brand or the first is out of stock · Bulk strips for repeated well-water checks
$9.99
in 6 guides
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HoneForest TDS Meter, Digital Water Tester (TDS, EC, Temperature)
Alternative TDS meter that also measures conductivity and temperature — same softener-verification role as HM Digital · More accurate TDS reading for tight replacement timing on multi-stage RO.
$13.97
in 3 guides
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Instant 4-in-1 TDS Meter Digital Water Tester 0–9990 PPM, EC+Temp
30-second test of softener effectiveness — read TDS before and after the unit · Track overall dissolved solids; note it does NOT read iron directly
$9.96
in 3 guides
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Hach Total Hardness Test Kit, Model 5-B, Drop Count Titration
Industry-standard drop-count titration — ±0.5 gpg accuracy for borderline cases and professional use · Drop-count titration for precise gpg when sizing a softener
$35.55
in 2 guides
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HM Digital TDS-3 Handheld TDS Meter
Post-softener verification — measures TDS to confirm ion exchange is working. NOT for initial hardness measurement · TDS reference reading — not a direct hardness test, but useful as a quick check
$14.50
in 2 guides
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WeAQUA DoubleCheck Water Hardness Test Kit (200 strips)
Double-pad design narrows the read between 1 and 5 gpg — useful if your water is on the moderately-hard / hard border. · Tighten the gpg reading after a fix to catch the difference between 1 and 5 gpg.
$9.97
in 2 guides
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WeAQUA Water Hardness Test Kit — DoubleCheck 50 Strips
Cheapest option at $5.97 — dual-pad design lets you verify each reading; 50 strips, fine for a one-time test · Two-pad design that separates low (0–25 gpg) and high (25–250 gpg) ranges — fewer false reads if your water is on the harder end of the scale.
$5.97
in 2 guides
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Bartovation Total Dissolved Iron Test Strips, 0-10 ppm, 25-Pack
Confirm iron ppm before you buy any treatment system
See Amazon
in 1 guide
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Bestprod All-New 21-in-1 Drinking Water Testing Kit Strips, Home Tap and Well Water Test Kit
One-pass baseline on a private well — iron, hardness, pH, more
See Amazon
in 1 guide
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Hach Total Hardness Test Kit, Model 5-EP
Higher-range Hach drop kit for very hard water (20+ gpg) where the Model 5-B runs out of drops too quickly
$58.09
in 1 guide
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Industrial Test Systems 481012 SenSafe Manganese Water Test Strip Kit, 12 Tests
Rule manganese in or out when stains are black or brown, not orange
See Amazon
in 1 guide
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MEXYBE 4-in-1 TDS Meter Digital Water Tester
Cheap meter to catch TDS creep before taste changes — replace based on data, not calendar.
$8.99
in 1 guide
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Total Water Hardness Test for Pool, Aquarium, Drinking Water
Confirm exact gpg before changing hardness settings
$34.99
in 1 guide
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WANJAO 10ML Hard Water Test Kit, Rapid Quality Testing for Water
Drops under $12 — for one-off pre-purchase check
$11.99
in 1 guide
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Water Hardness Test Kit with 5-Pads (150 Strips)
First kit in the drawer — test cold tap before and after a manual regen
$8.99
in 1 guide