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2. Oscillating multi-tool - Wikipedia

   en.wikipedia.org/wiki/Oscillating_multi-tool

   An oscillating multi-tool or oscillating saw is a multitool and power tool that oscillates (rather than rotating or reciprocating), powered by battery or mains. The name "multi-tool" is a reference to the many functions that this tool can perform with the range of attachments available.

3. Inductive sensor - Wikipedia

   en.wikipedia.org/wiki/Inductive_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 copper, may reduce the sensing range by up to 60 percent. [2]

4. Tesla coil - Wikipedia

   en.wikipedia.org/wiki/Tesla_coil

   The current flows rapidly back and forth between the plates of the capacitor through the coil, generating radio frequency oscillating current in the primary circuit at the circuit's resonant frequency. The oscillating magnetic field of the primary winding induces an oscillating current in the secondary winding (L2), by Faraday's law of ...

5. The Best Metal Detectors to Uncover Buried Treasure - AOL

   www.aol.com/lifestyle/best-metal-detectors...

   Scavenge for gold, coins, and other buried treasure with these metal detectors, including models from Garrett, Fisher, and National Geographic.

6. Electronic oscillator - Wikipedia

   en.wikipedia.org/wiki/Electronic_oscillator

   Simple relaxation oscillator made by feeding back an inverting Schmitt trigger's output voltage through a RC network to its input.. An electronic oscillator is an electronic circuit that produces a periodic, oscillating or alternating current (AC) signal, usually a sine wave, square wave or a triangle wave, [1] [2] [3] powered by a direct current (DC) source.

7. 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 ...