I am generally happy with the product but wanted to point out one thing that was unclear 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 provides an instruction manual that states 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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