I was wondering if anyone has used the different frequencies to give a better idea as to whether to dig or not. Using a.0.5gm gold as a target, the nox 800 identified a target in gold multi. I then switched to field 1 in 40khz and it detected the target. I then switched to 4khz and no noise. I have then tried this on an old nail, a tin lid, a lead sinker, a drink tab and all were identified as a target whereas the gold wasn't. Has anyone tried this or a variation using other combinations and had success. This is using the principle of the lower the frequency the less likely it will detect gold as an aid to finding it. . Cheers