help needed with nexus se

[magpie]

Hi all, l've been using my nexus for nearly a 4 mths now but still have some grey areas concerning the use of the machine there4 can any1 give me any info relating to the sensitivity on the nexus se, because the detector still seems to sensitive even after it has been balanced & the sens is switched to zero l'm still able to get signals from the soil l 've found items in for instance tiny flakes of iron or a bit of bronze that can still be seen from it's mould?l would appreciate any help thats available thanks magpie.