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How to Read Metal Detectors

Metal detection continues to grow as an enjoyable and profitable pastime. The earth is rich in precious metals and gemstones, as well as an ever-increasing amount of discarded or lost coins. Metal detectors vary in their design complexity, but basically all metal detectors work on the principle of transmitting into the ground a radio frequency that reacts to metal. There are a few basic steps involved with learning to accurately read the information returned by a detector.

Instructions

- 1
  Adjust the conductivity of the detector. Even simple or homemade metal detectors allow the user to find a frequency that will be free from outside interference yet still be sensitive enough to detect objects deep underground. Find an appropriate setting by holding the detector up in the air and adjust the frequency until the static is loud. Then return the frequency to the level immediately prior to the loud static signal.
- 2
  Listen for the signal, tone, or pulse as the detector scans the ground. Different metals will cause different signals. Iron and foil can be detected with very low conductivity, while silver requires the highest level of conductivity. Noticing the variation in signals will help you decipher the nature of the discovery. Headphones can help you distinguish between tones.
- 3
  Record findings in writing. Once the detector uncovers an object, the signal strength of the pulse and depth should be recorded, allowing the user to more accurately read the signal and adjust the frequency or sensitivity based on the desired metal. Certain types of coins will respond to specific signal transmissions and create a specific tone.
- 4
  Re-adjust and detect. Metal detectors can be fine-tuned to search for specific objects. The more information that is recorded, the more successful a search will be.

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