13 kHz Frequency: An ideal frequency for locating aged coins and relics, and gold nuggets. Available frequency shifting allows you to make slight improvements The sale of metal detectors is permitted in France. The very first usage of metal detectors in France which resulted in archaeological discoveries occurred in 1958: https://simonwgcil.tusblogos.com/27277631/the-smart-trick-of-types-of-metal-detector-sensor-that-no-one-is-discussing