Metal detectors can land you treasures if you use them properly. The techniques followed by the experts usually include one thing more than all else: patience. When you're combing the beaches, searching for historical treasures or even just trying to find one of the plumbing lines to your house, you have to remember that slowing down a little will make a huge difference. After all, if you're searching for something that's been underground for 50 years, it can wait a few more minutes to be found!
Most metal detectors function through creating a magnetic field. Disruptions in that field are detected by the device and trigger the sounds that let you know that there's metal below the Earth. The lower you hold your coils, the more deeply they'll penetrate into the ground. This means that you must hold out your detector as close to the ground as possible, all the time. While metal detectors do detect in a slightly larger range than the box that contains the coils would lead you to believe, it's best to only consider a patch of ground that's had the detector swung over it to be checked.
Walking with metal detectors is a bit like mowing a lawn or painting a driveway. Imagine that every sweep of the device knocks down a row of lawn but that, as when running a lawnmower, you have to overlap your sweeps. Do these sweeps slowly. You mustn't swing your arm energetically as you're detecting: it should be a slow, deliberate motion. The idea is to give your metal detector enough time to detect small amounts of metal under the surface and this is not generally possible with fast sweeps. If you're in an object-rich area, be sure to give extra time to each sweep.
Metal detectors have various sounds, according to what they detect. You should learn to determine the meanings of these sounds as accurately as you can. Iron, gold, silver, copper and steel will all make their own distinctive sounds in the device. The better you can differentiate among them the less time you'll spend digging up rusted nails and bottle caps. Experienced metal detector enthusiasts oftentimes pass over more signals than they investigate, simply because they're adept at determining when there's a point to checking that signal out and when it's one to be ignored.
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