Alright take a look at the pic below,,US nickel along with some nails and a big chunk of iron. Iron does come above plane of nickel here.
The ruler is in pic for scale and one other reason.
With the items laying as they are in pic,,,,Impact wearing smaller coil will detect nickel.
Sweep does have to be down the same line,,,as I have the ruler laid.
Even with some higher disc Impact will detect nickel.
Using 20khz a necessity.
Now I posted this pic,,,so if users decide to buy,,,this is something interesting about this pic and this detector wearing smaller coil.
Now the ruler is in pic,,so some scale for a person looking can see how close everything is to nickel,,and the bigger piece of iron.
Remember sweeping over the nickel in a line parallel to the way ruler is layed.
Remember the smallest coil is 4x7.5",, so the coil is partially over the bigger piece of iron and a lot of the nails.
Now,,if I covered this setup up with a sheet of newspaper,,and a person swung their Impact smallest coil in a fashion I've described here,,,they likely might not hear the nickel???
Why???
I have already posted some info here,,talking about the Impact's overload on a few objects.
So if a person swept low,,they would get overload signal--- the iron piece sure ain't small.
But if a person raises coil slightly to when overload tone ceases,,,,the nickel comes through as nonferrous tone,
So when out in the field,,folks who get an overload signal,,,DON'T dismiss as nothing there nonferrous wise to detect. And again remember the Impact detector's smallest coil measures 7.5" long.
This pic shows a I think very challenging nickel to detect with any detector wearing a smaller coil.
The ruler is in pic for scale and one other reason.
With the items laying as they are in pic,,,,Impact wearing smaller coil will detect nickel.
Sweep does have to be down the same line,,,as I have the ruler laid.
Even with some higher disc Impact will detect nickel.
Using 20khz a necessity.
Now I posted this pic,,,so if users decide to buy,,,this is something interesting about this pic and this detector wearing smaller coil.
Now the ruler is in pic,,so some scale for a person looking can see how close everything is to nickel,,and the bigger piece of iron.
Remember sweeping over the nickel in a line parallel to the way ruler is layed.
Remember the smallest coil is 4x7.5",, so the coil is partially over the bigger piece of iron and a lot of the nails.
Now,,if I covered this setup up with a sheet of newspaper,,and a person swung their Impact smallest coil in a fashion I've described here,,,they likely might not hear the nickel???
Why???
I have already posted some info here,,talking about the Impact's overload on a few objects.
So if a person swept low,,they would get overload signal--- the iron piece sure ain't small.
But if a person raises coil slightly to when overload tone ceases,,,,the nickel comes through as nonferrous tone,
So when out in the field,,folks who get an overload signal,,,DON'T dismiss as nothing there nonferrous wise to detect. And again remember the Impact detector's smallest coil measures 7.5" long.
This pic shows a I think very challenging nickel to detect with any detector wearing a smaller coil.