Quoted from MattElder:detectors offer multiple search frequencies, sometimes more than one at once. So you can identify items before you dig.
Thanks!
Okay, this caught my attention. How do the different frequencies help identify items?
I'm putting this into perspective with the work I do -
Sometimes I need to find a survey point. This point could be a 3" round brass, aluminum, or bronze disk. It could also be a 1/8" to 1" rebar driven into ground and covered by a plastic cap. These COULD be under a layer of forest leaves, OR, under a foot (or more) of dirt. In some cases, these markers will be alongside a road. And more than once, I've gotten a ping on my detector, and started digging, to either find trash, OR, .. not find anything. So in cases like this, yes - I would like to somehow know before I spend a good ten minutes on my knees along a road, digging up.. nothing.