HA, HA. I've got one! It works well. You just point it when you turn it on at something who's temperature your interested in. The first thing you point it at calibrates it as a reference temperature and also gives you a readout in F or C.
If you point it somewhere else with a different temperature the light showing the target changes from green to either red or blue, depending on if the new temp is below or above the reference temp from where you first pointed it. It also gives the numerical temperature just like a regular IR detector.
There is a handy switch that allows you to alter the trigger point from the reference temperature at either 1, 5, or 10 degrees to turn on the blue or red light. When I bought the thing I was just looking for a regular IR detector but this is better and very intuitive. (Also no more expensive.)
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