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Just a little ground testing with the Garrett ATpro, 5x8, the factory 8.5x11 and the big nel 15x17 coil.. I also tested the minelab safari with the 11' coil..
Just with clad dimes in the ground..
The 5x8 coil gets about 9 inches
The 8.5x11 coil gets up to around 9 to 12 inches?
The big nel 15x17 coil might get up to 15 inches.
The minelad safari 11' coil got up to 9 inches..