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Minelab Test area for 4500

Prospecting Australia

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I think you might need to go a bit deeper with your increments mate, I would think the 4500 is going to pick up a gram piece of lead pretty easily at 6 inches
 
A good test is to bury a target/s at about the limit you can detect it with the stock 11" coil.
That will give you a pretty good base for testing other coils against the stock.
Repeat for different sized & even shaped targets.
 

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