10 Best Water Hardness Test of 2025

Tested and Reviewed: Top 10 Water Hardness Test deals with expert ratings from 8.1 to a perfect 10

July 2025 Edition

Editor's Choice

9.7

HACH

Hach 145400 Total Hardness Test Kit, Model 5-EP

Editor's bottom line:

“This water hardness test is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Utilizes drop count titration - a simple, economical titration method
Kit contains all required reagents and apparatus in a rugged carrying case for analysis in the field
Country Of Origin: China
Water hardness is caused almost entirely by calcium and magnesium ions

Show Price

Picked by 334 people today

9.5

Save 10%

Hach Company

Hach 145300 Total Hardness Test Kit, Model 5-B

10% Off

Main Highlights

Trust the original Hach test kit! Simple drop-count titration measures hardness as CaCO3 (1 gpg = 17.1 mg/L). Utilizes drop count titration with a range of 1-30 gpg. Contains approximately 100 tests. Drop count titration - a simple, economical titration method!

Show Price

9.5

bestprod

Bestprod All-New 20 in 1 Drinking Water Testing Kit 120 Strips, Home Tap and Well Water Test Kit for Hardness, Lead, Iron, Copper, Chlorine, Fluoride

Free Shipping

Main Highlights

Clear Range: This house water testing kit offers clear, easy to read results and acceptable ranges for all substances. The water contaminant tester delivers clear results on any type of water
Easy to Use: The water hardness test kit for water softener is as easy as adding the water, setting a timer, and reading the results. The strips for water testing come with an easy-to-read results guide
Easy to Understand: The water tester for drinking water comes with a clear guide on the outside of the bottle that lines up with each strip, from alkaline level to soft characteristic readings
Data Sheet Included: These water testing kits for drinking water include a data sheet to record readings for later analysis. The complete water tester for chemicals has it all
Experience our live customer support: a dedicated team of water quality experts ready to offer rapid and efficient responses round the clock through live chat and email. We are committed to taking our customers' feedback seriously, as our sole aim is to deliver products and services that hold genuine value for you.

Show Price

9.2

Save 23%

VARIFY

Varify Water Hardness Test Kit - Water Testing Kit for Home, Drinking, Well, Spa, Swimming Pool, Softener, Dishwasher & More - Hard Water Test Strips for Calcium, Magnesium etc (0-425 pmm, 150 Strips)

23% OffFree Shipping

Main Highlights

PROTECT YOUR HOME AND WELLNESS: Understand the impact of hard water on your home and health. Hard water can damage appliances, clog pipes, and affect your skin and hair. By using Varify's Water Testing Kit to monitor your water's hardness, you're taking an important step in preventing potential damage and ensuring the well-being of your household.
QUICK AND ACCURATE RESULTS: Discover the ease and precision of Varify Water Hardness Test Kit. In just seconds, get reliable readings on the hardness of your drinking water, pool, or any other water source. Our simple dip-and-read approach ensures you don't have to wait or travel for accurate water quality information.
EASY-TO-READ COLOR CHART: Experience hassle-free testing with our oversized color chart, designed for effortless result reading. Varify's clear visual guide ranges from red to green, enabling you to quickly understand water hardness levels from 0-25 GPG and 0-425 PPM. Making water testing accessible and straightforward for everyone.
EXTENDED SHELF LIFE WITH VARIFY FRESHSEAL: Enjoy the convenience of our Varify Water Testing Kit, which comes with 100 total hardness test strips in a ready-to-use bottle and two separately sealed pouches for extended freshness. Our innovative FreshSeal technology guarantees the reliability and accuracy of each test, long after your first use.
SUPPORT CLEAN WATER INITIATIVES: With every Varify's Water Hardness Test Kit, you contribute to providing clean water for a year to someone in the Central African Republic. Make a difference in the world's water crisis and support our mission for #WaterForGood and #CleanWaterWorldwide with each water test you perform.

Show Price

Best Value

9.0

Save 33%

JNW Direct

JNW Direct - Quick & Accurate Hardness Test Strips - Ultimate Water Hardness Test Kit - 150 Strips with eBook

33% OffFree Shipping

Main Highlights

CHECK WATER HARDNESS: This handy water hardness test kit allows you to test the hardness of all water sources, from home faucets and taps, to well water, water softeners, dishwashers, showers, aquariums, and many more
MULTIPLE USES: The right levels of water hardness can make a huge difference in the softness of your laundry. Determine whether your water softener is working as efficiently as expected with this water softness test kit. It also helps you keep tabs on your water conditioning and reverse osmosis systems
QUICK & ACCURATE: With this water hardness test kit for water softener its quick and easy to accurately measure water hardness! The hardness water tester offers instant reliable results with simple and clear instructions. Simply dip and compare with the color chart
150 TEST STRIPS: Get more for your money with our soft and hard water test kit. The hard and soft water test kit contains 150 water hardness test strips that can be used to test home faucets and taps, well water, water softeners, dishwashers, showers, and many other water sources
INCLUDES EBOOK: Our hard water tester strips come with a handy eBook packed with information about your water hardness. Record, track and monitor the results of your water test strips with ultimate accuracy for best results

Show Price

8.8

Save 18%

MEXYBE

2024 All-New 4 in 1 Tds Meter Digital Water Tester - Accurate and Reliable TDS EC & Temp(°C,°F) Meter - 0-9990ppm - Professional Testing for Drinking Water, RO/DI System, Aquariums etc

18% OffFree Shipping

Main Highlights

Reliable Brand: MEXYBE was founded with a simple yet important mission: to provide everyone with a accurate and reliable way to test their water quality. We believe that access to clean and safe drinking water is a basic human right, and our tds meter digital water tester is one professional way that can help people achieve that. We are committed to providing high-quality products and excellent customer service. Join us in our mission to make clean and safe water accessible to everyone
Accurate and Reliable Results: Tired of getting unreliable readings from other water testers? Look no further. The MEXYBE 2024 ALL-NEW water quality tester features a high-precision chip and a premium titanium alloy probe, ensuring accurate and reliable results every time. Equipped with cutting-edge technology and advanced features, it's the ultimate choice for precise water testing. So why wait? Experience dependable testing performance for you and your family today
Multifunctional (4 in 1) and 5 Upgraded: Professional TDS (Total Dissolved Solids), EC (Electrical Conductivity), Temperature (Degree Centigrade) and Temperature (Fahrenheit) Meter 4 in 1. Upgraded with big backlit LCD for easier reading, auto-lock function for easier use, factory calibrated and hold function for direct use and auto-0ff in 2 minutes to conserve battery. These enhancements make it a user-friendly tds meter digital water tester for a variety of applications
Two User-Friendly Features:1. 25% Larger Backlit LCD: The MEXYBE 2024 4-in-1 water quality tester has a screen that's 25% bigger than older 3 in 1 models the market, making it easier to read for everyone, including seniors and children. 2. Convenient TDS Chart: A colorful TDS chart is placed on the back of the tester and in the user guide, so you can quickly understand PPM values without searching onlinesaving you time with every test
Multipurpose Tds Tester: Test the purity of drinking water to ensure it's safe and healthy, monitor if Reverse Osmosis (RO)/Deionization(DI) System works properly, whether filter need replaced, maintenance aquarium, hydroponics(test nutrients), well, pool, hot tub, spa and testing tap water, bottle water etc
Give the Gift of Health: Looking for the perfect gift for your family and friends? Look no further than our water testing kit for drinking water! Our easy-to-use device lets you quickly and accurately test the purity of any water source, giving you peace of mind that you're drinking clean and healthy water. Whether you're shopping for a health-conscious loved one, a new homeowner, or someone who enjoys outdoor activities like camping and hiking, our tds water test kit makes the perfect gift
Experience our live customer support: a dedicated team of water quality experts ready to offer rapid and efficient responses round the clock through live chat and email. We are committed to taking our customers' feedback seriously, as our sole aim is to deliver products and services that hold genuine value for you
Better water, better life. Experience the difference of pure and healthy water with your FAMILY by MEXYBE 2024 all-new 4 in 1 tds meter digital water tester!

Show Price

8.6

BOSIKE

BOSIKE 2 in 1 Water Test Kit Hardness & pH - 150 Strips - Hard Water Tester for Tap Drinking - Softener, Dishwasher, Pool, Spa & Well Testing Kits

Free Shipping

Main Highlights

Enhance Pool Maintenance: Elevate your pool's upkeep with our 2-in-1 water hardness test. Combat limescale buildup for improved plumbing and water pressure, ensuring a revitalizing swim.
Everyday Comfort: Take control of water quality. Detect and tackle issues like metallic taste and staining from low pH, or scaly deposits from high pH. Enjoy better-tasting beverages and stain-free fabrics with balanced pH levels.
High-Precision: These water hardness test strips are designed specifically for warm water that can easily provide instant and reliable results. Use at least twice per week or as needed to monitor your water quality at regular intervals.
Long-lasting Assurance: Packaged in a tightly sealed bottle, our test strips maintain their efficacy over time, ensuring your pool, spa, or hot tub water remains balanced, clean, and clear for extended periods.
Home Spa Confidence: Say goodbye to costly trips to the pool store. Save time, money, and stress with BOSIKE test strips, empowering you to confidently maintain a perfectly balanced spa experience at home.

Show Price

8.3

Merydi

Water Hardness Test Kit,150 Strips-Double Color Pads,Hard Water Test Kit for Home,Drinking Water Tap Water Well Pool Spa Water Softener Quick Accurate Water Quality Testing Kit with Sample Tube

Free Shipping

Main Highlights

EASY ACCURATE DOUBLE COLOR PADS: Each tester strip is designed with two identical color pads to weed out bad color pads gives more accurate results ,If the color of the pads differs after testing, it indicates that the test may not be reliable and a new test should be performed.
150 STRIPS WATER HARDNESS TESTS: This water hardness test kit contains 150 counts hardness water test strips and 1 test tube. Ideal for monitoring water quality in Home water hardness and water softener.
QUICK WATER TEST STRIPS : Suitable for home faucets & taps, drinking water, well water, softener, dishwasher,making them indispensable for both household use and professional maintenance of spas and pools.
HIGH ACCURACY WATER SOFTENER TEST STRIPS: Merydi Home water hardness test strips are made of high-quality fiber paper and no color bleeding pads,can easily provide instant and reliable results,Use at least twice per week or as needed to monitor your water quality at regular intervals.
FOR BEST RESULTS: Read results in natural daylight,Keep wet fingers out of the bottle and store test strips in a cool, dry place. Test strips are not reusable.

Show Price

8.1

WEAQUA

Weaqua Water Hardness Test Kit - DoubleCheck200 Strips with Sample Cup - Hard Water Testing Kit

Free Shipping

Main Highlights

DOUBLE CHECK - Each tester strip is designed with two identical color pads. If the color of the pads differs after testing, it indicates that the test may not be reliable and a new test should be performed.
SAMPLE CUP INCLUDED - Ensure the most accurate water hardness tester results by using the included, free sample cup and fill the testing water to the marked level.
200 WATER TEST STRIPS @ $0.04 EACH - Maximize the time between each purchase with the lowest cost-per-test water hardness test strips that are available.
LONGEST SHELF LIFE - Individually wrapped in packs of 50 to prevent unused strips from going bad due to too much contact with air. Dual, top-and-bottom desiccant design forms a dry force shield around the strips which also prevents the strips from going bad due to too much contact with moisture.
EASILY THE MOST ACCURATE - DoubleCheck to weed out bad color pads, sample cup with pre-measured water level for the most optimum water to test strip ratio, individually wrapped and dual desiccant design gives more accurate results for a longer period of time.

Show Price

8.1

Pawfly

Pawfly Water Hardness Test Kits, 100 Strips Hard Water Test Kit for Drinking Water Tap Water Well Pool Spa Water Softener Quick Accurate Water Quality Testing Kit for Calcium & Magnesium (0-425 PPM)

Free Shipping

Main Highlights

Water Hardness Test Strips: This home water test kit quickly detects the hardness of all water. Always provide real-time tests to keep water clean and safe to drink or use.
Easy to Use: First, immerse one test strip into the water sample for 2 sec. Second, take out the strip and hold it horizontally for 15 sec. Last, compare the result with the color chart on the ziplock bag.
Fast & Accurate Result: The water testing kits are highly sensitive to detect even low levels of water hardness. Test range: 0-425 PPM or 0-25 GPG. And the easy-to-read color chart allows you to instantly interpret the test results.
Regular Test: The water hardness test kit contains 100 strips in total. Really convenient to monitor the water quality at regular intervals. Effectively help maintain optimal water conditions to reduce limescale on pipes or home appliances. (The shelf life is 2 years before opening and 100 days after opening.)
Reliable Material: Made of dependable fiber paper, the water testing kit provides instant results. Widely applicable to drinking water, tap water, wells, showers, water softeners, swimming pools, spas, laboratories, industry, etc.

Show Price

Our Best Overall Choice

Best Choice

9.7

HACH

Hach 145400 Total Hardness Test Kit, Model 5-EP

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Utilizes drop count titration - a simple, economical titration method
Kit contains all required reagents and apparatus in a rugged carrying case for analysis in the field
Country Of Origin: China
Water hardness is caused almost entirely by calcium and magnesium ions

Show Price

Related Deals You Might Like for Water Hardness Test

HoneForest Water Quality Tester, Accurate and Reliable, TDS Meter, EC Meter & Temperature Meter 3 in 1, 0-9990ppm, Ideal Water Test Meter for Drinking Water, Aquariums, etc.

Show PriceView

DIPSTIK Water Hardness Test Kit-150 Strips Water Quality Testing for Drinking/Well Water, Softener,Hard, Dishwasher,Pool,Spa, 0-425 ppm

22% Off

Show PriceView

Ainkter Water Hardness Test Kits - Hard Water Test Kits for Drinking Water Well Hot Tub Spa Swimming Pool Dishwasher Water Softener - Quick & Accurate Water Hardness Test Strips for Calcium, Magnesium

15% Off

Show PriceView

Aqualuna Water Hardness Test Kit - Fast and Accurate Testing for Dishwasher, Drinking Water, Pool and Aquarium - 100 Strips Hard Water Test Kit at 0-425ppm - Maintain Water Quality

Show PriceView

Water Hardness Test Kit - Fast & Accurate Water Quality Testing Kit for Water Softener, Swimming Pool, Fish Tank, & Spa Hardness Test |150 Water Hardness Test Strips for 150 Tests|0-425 ppm & 0-25 gpg

Show PriceView

TDS Meter Digital Water Tester, Professional 3-in-1 TDS, Temperature and EC Meter with Carrying Case, 0-9999ppm, Ideal ppm Meter for Drinking Water, Aquariums and More

8% Off

Show PriceView

Liberty Gold Standard© Water Hardness 3-1 Test Strips (120-Piece): Water Testing Kit for Home, Drinking, Well, Spa, Swimming Pool, Softener, Dishwasher for Calcium Magnesium and Salt Levels

Show PriceView

Industrial Test Systems WaterWorks 481108 Total Hardness Test Strip, 3 Second Test, 0-1000ppm Range, Our #1 Test Strip for Total Hardness, Bottle of 50 Tests, Tan

Show PriceView

Water Testing Kits for Drinking Water: 125 Strips 16 in 1 Well and Drinking Water Test Kit, TESPERT Water Test Strips with Hardness, pH, Lead, Iron, Copper, Chlorine, and More

35% Off

Show PriceView

Hach 145400 Total Hardness Test Kit, Model 5-EP

Show PriceView

Deals are Live

Special Amazon deal ends in: