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2. Metal detector - Wikipedia

   en.wikipedia.org/wiki/Metal_detector

   A metal detector is an instrument that detects the nearby presence of metal. Metal detectors are useful for finding metal objects on the surface, underground, and under water. A metal detector consists of a control box, an adjustable shaft, and a variable-shaped pickup coil. When the coil nears metal, the control box signals its presence with a ...

3. Here's what you need to know about metal detectors ... - AOL

   www.aol.com/heres-know-metal-detectors-coming...

   The OPENGATE system is a battery-operated walk-through detector that consists of two free-standing pillars that are 6 feet tall. Metal-detecting hand wands were also purchased and can be used in ...

4. Magnetometer - Wikipedia

   en.wikipedia.org/wiki/Magnetometer

   Magnetometers can be used as metal detectors: they can detect only magnetic metals, but can detect such metals at a much greater distance than conventional metal detectors, which rely on conductivity. Magnetometers are capable of detecting large objects, such as cars, at over 10 metres (33 ft), while a conventional metal detector's range is ...

5. Induction loop - Wikipedia

   en.wikipedia.org/wiki/Induction_loop

   Induction loop. An induction or inductive loop is an electromagnetic communication or detection system which uses a moving magnet or an alternating current to induce an electric current in a nearby wire. Induction loops are used for transmission and reception of communication signals, or for detection of metal objects in metal detectors or ...

6. Stud finder - Wikipedia

   en.wikipedia.org/wiki/Stud_finder

   1st generation stud finder that utilizes a moving magnet. A stud finder (also stud detector or stud sensor) is a handheld device used with wood buildings to locate framing studs located behind the final walling surface, usually drywall. While there are many different stud finders available, most fall into two main categories: magnetic stud ...

7. Inductive sensor - Wikipedia

   en.wikipedia.org/wiki/Inductive_sensor

   An inductive proximity sensor is a non-contact electronic proximity sensor. It is used for positioning and detection of metal objects. The sensing range of an inductive switch is dependent on the type of metal being detected. Ferrous metals, such as iron and steel, allow for a longer sensing range, while nonferrous metals, such as aluminum and ...