it detects in any object whether there is any moisture
for example your hand would make the led light up
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A gold detector will find diamonds if they are surrounded by gold. A gold detector cannot find a lose diamond that is not set in gold, because you're using a detector of gold, not diamonds.
The metal detector was invented in 1931 by Gerhard Fisher.
detector or metal detectors
An easily found carbon monoxide detector
This type of detector is of no importance for electric powered refrigeration systems, as ammonia is not used in them. This type of detector is a safety device for natural gas and propane powered refrigeration systems as ammonia is the coolant in such systems and a leak of ammonia vapor is toxic.