These are the exact same pH strips my parents used years ago to check the chlorine levels in our pool. After hearing so much babble about how high acid levels in the body can cause cell damage, I decided to see what they show when I test my urine and saliva. You have to wait 15 seconds. The strip will darken immediately when liquid enters. And unfortunately the environment in my body seems to have toxic high acidity as the strip seemed to get as dark as possible when I tried the strips in both urine and saliva. And this is where it starts to lose some of its usefulness. Once the pH rises above 7.0, it becomes difficult to distinguish darker shades. I assume that similar problems can occur with test strips of any brand. I think it's useful since you can tell if something is more acidic or basic, but maybe not so much to put a more precise point on it.
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