Compactness and Ease of Use of the Device
Security scanners are light enough to be held in one hand. The device indicates the presence of a large metal item, presumably a gun or knife, on the person being checked by a slight vibration. This allows not to attract the attention of the "subject" until the staff is sure of their trustworthiness. If desired, the vibration signal can easily be replaced with a normal audio alert.
Treasures Buried Literally Underfoot!
Metal Detectors of the second type are significantly larger in size, and using them for a long time is quite tiring. However, such an invention allows you to detect a zinc, silver, or gold coin lying in the ground at a depth of half a meter! To prevent your hand from getting too tired from holding the metal detector aloft, an armrest is provided, which reduces the strain on muscles and joints. Nevertheless, an unprepared person is unlikely to spend more than a couple of hours on the exciting search for "treasures".
Acting Stealthily and Quietly
As a rule, to avoid attracting the attention of onlookers who might interfere with the excavation, seekers use headphones. In this case, the monotonous beeping of the device will not annoy those around you and will not reveal to competitors that you have stumbled upon another rarity. If desired, you can use the display image instead of the sound signal, which shows how far you have moved away from or approached the target.
Low Frequencies and Pulses – Which Operating Principle to Choose?
Among metal detectors, one can distinguish those that operate using low frequencies, as well as those that operate on the pulse principle. Low-frequency devices are in high demand due to their relative cheapness and ease of operation. For scientific expeditions, excavations in difficult conditions, and underwater searches, pulse devices are purchased.
Finding a Coin Under Piles of Trash!
The most difficult problem for the owner of a standard metal detector has been and remains the abundance of iron junk in the ground, accumulated there over many centuries. In some cases, such finds have certain museum value – for example, if it is an old village utensil or a spearhead. But modern trash – bottle caps, nails, and other unnecessary items – generates many false signals.
To make the device respond only to items of a certain shape and size, ignoring objects made of any materials – it must be configured in advance. Many treasure hunters buy devices that specialize in a single type of metal, usually gold. However, we still recommend that you do not limit yourself to such specification, because in the ground, besides precious stones and lost jewelry, many surprises may be hidden for a careful prospector!
_