Industrial Test Systems 481348 Copper 3 in 1 Pool Check | Made in USA | 3 Parameter Pool Test Strips | Copper, pH, & Total Alkalinity | Easy Match Colors | Lowest Copper Detection Levels

so easy to use and very accurate when testing for copper

Used them to test our drinking water.

I liked using these Tester strips because they gave a much clearer reading than some of the other test strips I have purchased. They only gauge total alkalinity, PH, and copper, but since I could not get copper testing with many other strips, I'm happy to have these.. I tested them against a different kind of strip to gauge their accuracy and I found these to give a more accurate reading regarding the chemical content of my pool. I will say that the copper reading is a bit funny in that you have to fold the test strip in half and then look at the clearish the clearest transparent portion of the strip to match the color coding and read how much copper is in your pool. It's not a huge issue, but it isn't ideal. Still, for this price I'm satisfied with these copper test strips

Clear readings unlike competitors.

Awesome

Works as expected with salt water pool.

These test strips are easy to use. We use a pool ionizer in our swimming pool and use these to measure the copper level. Will purchase again.

I have been using these for years and one day read the comments about accuracy. Purchased an actual chemical test kit and boy was it off from the test strips. I have been struggling to keep my pool clear. Come to find out alkinity on test strips way off by 100ppm. PH closer read but it alkalinity is off doesn't matter