Metal detector frequency is measured in kilo hertz (kHz). Kilo is a unit prefix in the metric system denoting multiplication of the unit by one thousand. One kilogram equals 1000 grams. Relating to metal detectors, a metal detector that has a 6 kHz frequency will transmit and receive 6,000 times per second. A metal detector with a frequency of 25.5 kHz will transmit and receive 25,500 times per second and so on.
Very low frequency (VLF), also known as induction balance, is probably the most popular detector technology in use today. The lower a metal detector's frequency, the deeper it can read, however, sensitivity to small items is reduced. The higher the frequency the more shallow it reads and it is more sensitive.
The consensus is that a low frequency detector is more sensitive to silver and copper, can detect items deeper and is better at rejecting the 'trash' metal. If you want to hunt for coins, and relics the low frequency detector is the best for that. Lower frequencies have a longer wavelength that's further apart making them more receptive to higher energy targets. Lower frequencies tend to do better in mineralized ground, but are not as sensitive to small targets. If your detector is a general purpose detector it probably operates at a lower frequency.
Higher frequencies have a shorter wavelength that is closer together. Higher frequency detectors are more sensitive to small metals and natural gold. However, they have difficulties with discriminating against ferrous (of iron) and nonferrous (not of iron) metals. Their sensitivity to small metals makes them tedious to use around trashy areas. Most gold prospecting detectors operate at higher frequencies.
If you're hunting for natural gold and small metals you would use a higher frequency detector. The problem is you will also pick up nonferrous metals like iron. It is best to stay away from trashy areas with these.
Going out and working with your metal detector and playing with the different frequencies will help you understand and be better able to determine what and how your particular metal detector's frequency detects what it does. There is a lot more you will be playing around with, testing, trying and tweaking as you go along. That's how you get to know your detector. Keep plugging away and you will know your detector like your best friend. Detector frequency is only a small part of the equation. Have fun and Happy Treasure Hunting!
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