Did an air test with my F70 with 3 F70 coils and a F5 coil.
Used the coils for the F70 , the sniper 6.5X3.5, a 11DD a NEL 12.5X8.5 and a F5 10 concentric coil.
Set the F70 Sens at 80, the Disc at 15 and the Threshold at -3, in de mode.
Passed a cent, a nickel, a dime and a quarter across the coil multiple times to get a number reading, then tested for "depth".
The test was done in a room with twin 4 ft. dual flouresent light fixtures.This was done as a baseline test and results will be different in outside weather and ground conditions.
The sniper coil was 5 to 5-1/2 inch depth.
The 11DD was 7 to 7-1/2 inch depth.
The Nel 12-1/2X8-1/2 was 8 to 8-1/2 inch depth.
The F5 10concentric was 5-1/2 to 6-1/4 inch depth.
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