Originally Posted by: oroplata
I think silver 3d and 6d's read low because they're so damn thin. Especially the badly worn ex-necklace vickies.
True that. Also the deeper a target the more inaccurate its VDI will be, for a shilling size or smaller the possibility of this inaccuracy starts at only around 4-6" and this will apply to most detector makes. By the time you get down to 8-10" the VDI can be very unreliable especially if the ground contains a lot of minerals or fertilizer or even if it's dry.
Best to not rely on the detector to much. For example pull tabs will ring up clean but are normally shallower then silvers, thus if it is only a couple of cm below the surface - ignore it, but if its deep - dig. Cans have a large detection field so if the object pin points as a large one then chances are it will be a can (also if it still tones off with the coil lifted it will also be a can). The VDI is only a rough guide - your choice to dig or not should take a lot more things into account.
Also remember the majority of our "silvers" only contain 50% silver and thus will ring up lower then the pre-1933 English ones.
Edited by user Sunday, 14 July 2013 11:03:00 AM(UTC)
| Reason: Not specified