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What is the difference between a metal detector and a GPR?Updated a year ago

Question: What is the difference between a metal detector and a GPR?

 

Answer: 

A metal detector uses two coils, one sends and the other receives, to pick up on targets in the ground. When a target is found, a current is formed, the receiver coil takes the signal and amplifies it to be heard through a speaker or headphones. No image is given.
 
A GPR uses radar pulses to send an image back to the software used in the GPR unit.
 
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