I am generally pleased with the product, but I wanted to point out a confusing point in the instructions. The instructions say to soak the strip for 15 seconds. in 75 degree water. When I first used the product I thought I would have to take a sample and wait for it to cool down to 75 degrees. After further research I found that the dive time depends on the water temperature and the manufacturer supplies an instruction manual that lists the dive time as a function of temperature. For spa water (typically 95-105 degrees), the immersion time is only 10 seconds.
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