Metal Detectors

LARRY GILMAN Metal detectors use electromagnetic fields to detect the presence of metallic objects. They exist in a variety of walk-through, hand-held, and vehicle-mounted models and are used to search personnel for hidden metallic objects at entrances to airports, public schools, courthouses, and other guarded spaces; to hunt for landmines, archaeological artifacts, and miscellaneous valuables; […]

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Two-Way Radios

Two-way radio systems have been used for business, public safety, and security communications for more than fifty years. Prior to the introduction of cell phones, two-way radios were really the only option when you wanted two-way communications with someone on the go. Two-way radios consist of two parts, a radio transmitter, and a radio receiver. […]

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