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the number 0-30 mostly represents iron
Hearing metals / gold through tones
The Vortex models feature both multi-frequency (5 to 25 KHz) and single frequencies and are waterproof up to 5 meters underwater
for reasons of price
Fisher FX3 Eisen Magnetometer rec_vortexapex the number 0-30 mostly representsThe Fisher FX3 Iron Magnetometer is used for metal detection, especially for finding iron objects. Weighing only 1. 1 kg, it is a very light device that is very easy to operate with just one button. It is a motion detector that can only register signals while it is in motion. After switching it on, the user simply has to walk around and wait until the detector reacts. This happens through an audible signal, which increases in pitch and volume the
