Cave detection

[swampgas]

There was a handheld temperature indicator that used to be advertised in the Kellyco catalogue years ago. It enabled a temperature variation to be detected a few feet deep when pointed at the side of a hill. It would pickup the cooler air if a void was present on the other side of a covered cave. Are these still made and where or no longer available because they did not work

 

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[robertk]

Sounds like you could do that with a laser thermometer. Not sure what the range is on them though.