If you want extremely accurate spa / pool water testing, without the guess work of reading the color of dip type test strips, than this is the way to go. These are the same test disks that your pool and spa store uses to test your water. Disks come in a box of 50, and are individually foil packaged and sealed with the expiry date indicated. You do require the LaMotte Waterlink SpinTouch tester to spin and read the disks which is not cheap. Each water test costs +/- $2.70 each US$ and takes appox 60 seconds. I invested in the LaMotte Waterlink SpinTouch because I was fed up with misreading test strips and then over or under treating our spa water. The Lamotte WaterLink disks help me maintain my spa water in a perfect balance, no guess work.
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