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- Apr 5, 2016
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Hi roy i have had the 705 for a few year now with the 18.75 dd concentric coil....ive been told when in prospecting mode its operating in full power...18.75htz....And is much better for things like gold chains and small targets...also for working in mineralized ground ect...but the 7.5...is supposed to be better for coins.... park hunts ect...and apparently..... will penitrate that bit deeper than the 18.75...but as i said ive only used the consentric coil...And im happy just using that for everything. Have had to dig a foot down for a bit of barb wire multiple times in prospecting mode