A deep seeking metal detector is designed to detect deep targets, or targets that are buried deeper than a normal metal detector is capable of detecting. Some deep seeking metal detectors are designed to detect targets at depths of up to 6 feet.
The depth of detection is primarily dependent on the frequency of the search coil. The higher the frequency, the deeper the detector can detect. The most common frequencies used in deep seeking metal detectors are 8.5 kHz, 10 kHz, 12 kHz and 14 kHz.