DoubleCheck Water Hardness Test Kit 200 Strips with Sample Cup

These strips worked perfectly. Check out the first picture below. We are on a well with horribly hard water. But we have a water softener. The strips closest to the camera are the well water prior to running through the softener, the strip in the back is after running through the softener. The colors are easily readable - the pads in the front are brown, the water is VERY hard. The pads in the back are green, the water is very soft, so my softener is working. (Note - there are 2 color pads on each strip - those are just to ensure that the strips are functioning. No matter what color the pads turn, they must match on both color pads.) The price is super reasonable - $10. Also, the kit comes with 200 strips, which is probably going to be a lifetime supply for me...

Easy to use. Delivers results as stated. Would recommend .

Works well, works quickly. Easy to compare to provided color codes. Appears to be very accurate when testing untreated water compared to softened water.

I recently tried the DoubleCheck Water Hardness Test Kit 200 Strips, and it’s a reliable tool for monitoring hard water at home or in your aquarium. The test strips are easy to use—just dip, wait, and read the result quickly. They deliver accurate readings within one or two degrees of more professional kits, which is impressive for such a simple tool. What really stands out is the high strip count (200)—perfect for long-term use or frequent testing, and the color chart on the bottle makes it easy to interpret results. Plus, the compact packaging is ideal for storage. That said, the color matching isn’t flawless in low light, so I recommend testing under good lighting or comparing to a photo of the chart. Also, since the results are visual, subtle differences in water hardness can be hard to distinguish without a magnifier. Overall, I’m giving it 4 out of 5 stars—a dependable, cost-effective kit for anyone needing regular water hardness checks, with just a couple of minor usability quirks.

These worked very well and simple instructions to follow.

The test worked well, and quickly informed us that our water hardness is "off the charts" high. We really didn't need 200 test strips, though---one or two would've been sufficient.

Dont be shocked. Says two hundred strips. When I opened the tube I thought there is no way there is two hundred. So, I took them out and counted. 50 test strips. Then I realized there were also three sealed envelopes in the box that ultimately contained 50 more each. They are a basic water hardness test strip and thats all the test, but easy to use. Nice having the sealed bags to keep the other strips moisture free from humidity or otherwise.

It likely worked as designed. One suggestion, the colors are very close from one another. For people with some color blindness then it would be difficult to tell the difference among them. Perhaps make the guild color hue more contrast for easier identification. So I would recommend using a test meter instead

Fácil de usar. Sin embargo, la coloración de las tiras no se corresponde plenamente con la coloración del rango que aparece en el bote. En mi caso, la coloración es más verde que el mejor verde en el bote. No me quejo porque eso es bueno, pero no hay una correspondencia exacta entre la tira y los copies en el bote

It's expensive, but worth it. It won't give you an exact number but tells you the range of hardness in seconds. Very useful for monitoring your softner

Work very well Giving you a good indication of the softness/Hardness of your water Highly recommend

Easy to use. Readings make sense.

Easy and accurate