Well, actually, I used my laser (infrared) thermometer to check the actual wort temp against the strip before. I found the strips to be within .3 to .6 of actual internal temp. So they're fairly accurate.
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My insulated STC-1000 probe and stick on thermometer are almost always at the same temps too. Of course, that's with glass carboys. I imagine if you had a temperature strip on the outside of a plastic bucket it wouldn't be nearly as accurate.