D+caf test strips are simply little strips of paper coated with antibodies that tell if your beverage is properly decaffeinated, turning up blue lines if it's got more than 20mg of caffeine per 6oz serving.The strips are 98 percent accurate for detecting caffeine, plus you have to use them before you add anything else to your coffee tea, like milk or sugar. And at $10 for a pack of 20, you're paying 50 cents a strip.
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