DoubleCheck Water Hardness Test Kit 200 Strips with Sample Cup - Hard Water Testing Strips (0-25 gpg / 0-425 ppm)

Great product works perfectly, I found out that where I live only the hot water is softened. I didn’t know it could be set up like that. So I wanted to check. All signs show this place as having really hard water. Both are true the cold water is off the charts for really hard water and the hot water is soft. Great value the color accuracy is better than I expected and was so easy to understand I definitely recommend purchasing comes with more than enough to last for a long time

Reasonable price and quality

A very generous supply of easy to use test strips. I like that there are several sealed packages of strips resulting in greater shelf life. They seem accurate however the low degree of precision takes some getting used to. (For greater precision an expensive meter would be required.) Overall a good selection for basic hardness checking.

Very good product. I suspected my water softener was not working properly and this test productproved my point. I was then able to get the company that I purchased the softener unit from to make the necessary repair.

used to check whether our water softener was doing its job (was not just like we thought). Needed something to show the repair company how hard the water was

typical kit - works well - nice to have the strips stored in a sealed container to preserve them better

The strips are easy to use, and are accurate enough for my purpose. Water coming into the house is hard (3), water from the taps is soft (0), so I'm confident my water softener is working. I agree with other customers that the strips in the tube can be stale, and may not give accurate results. I got better (less ambiguous) readings from a fresh pack of strips. I would suggest that all four sets of strips be packaged in sealed pouches. That way all of the strips would be usable.I would actually prefer to buy single strips in individual sealed pouches. I only need to use two per month to verify that my incoming water hasn't changed and the softener is working.

These test strips provide accurate water hardness measurements. My previously purchased test strips were well beyond their expiration date and providing erroneous test results. I would recommend paying close attention to the expiration date of previously purchased test strips.