5 Best Metal Detectors for Gold Nuggets (Oct .
Specialist golddetecting machines will pick up all metals but they are tweaked to find the conductivity that gold creates, and to discriminate between that signal and the signals thrown up by other metals such as iron and aluminum. Operating Frequency. A kilohertz or a kHz is the number of waves a metal detector can send into the soil. For example, 5 kHz sends 5000 waves per second. The ...