Hi Max
it detects ancient treasure very good and have a good pinpoint .it can discriminate between only gold & silver no other metals and doesn't detect other metals at all .it dosen't reaction on iron and other metals... it works well on air or in ground testing .but when you're on a treasure mound in real field test it detect treasure but it become unstable and detects anomalous.
please more explain about "so say that sometimes it sounds and you don't know why...(?) " it has not any VCO or voice indicator ?!.
it's not sensitive to humidity or temperature but when soil moisture is high increases fault signals
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