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  2. This handheld metal detector is a fun way to hunt for ... - AOL

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  4. Metal detector - Wikipedia

    en.wikipedia.org/wiki/Metal_detector

    U.S. Army soldiers use a military standard 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 [dubious – discuss], and a variable-shaped ...

  5. Nonlinear junction detector - Wikipedia

    en.wikipedia.org/wiki/Nonlinear_junction_detector

    The detector has a sensitive receiver tuned to these harmonics, as well as appropriate processing and displays to make their presence known to the user of the device. Because the basis of almost all semiconductor electronics is the p-n junction, an NLJD is correspondingly capable of detecting almost any unshielded electronic device containing ...

  6. Electroscope - Wikipedia

    en.wikipedia.org/wiki/Electroscope

    When the metal terminal is touched with a charged object, the gold leaves spread apart in an inverted 'V'. This is because some of the charge from the object is conducted through the terminal and metal rod to the leaves. [11] Since the leaves receive the same sign charge they repel each other and thus diverge.

  7. Gaseous ionization detector - Wikipedia

    en.wikipedia.org/wiki/Gaseous_ionization_detector

    The three basic types of gaseous ionization detectors are 1) ionization chambers, 2) proportional counters, and 3) Geiger–Müller tubes All of these have the same basic design of two electrodes separated by air or a special fill gas, but each uses a different method to measure the total number of ion-pairs that are collected. [ 1 ]