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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. Long-range locator - Wikipedia

   en.wikipedia.org/wiki/Long-range_locator

   Long-range locator. A long-range locator is a class of fraudulent devices purported to be a type of metal detector, supposedly able to detect a variety of substances, including gold, drugs and explosives; most are said to operate on a principle of resonance with the material being detected.

4. Magnetometer - Wikipedia

   en.wikipedia.org/wiki/Magnetometer

   A magnetometer is a device that measures magnetic field or magnetic dipole moment. Different types of magnetometers measure the direction, strength, or relative change of a magnetic field at a particular location. A compass is one such device, one that measures the direction of an ambient magnetic field, in this case, the Earth's magnetic field.

5. List of metal detecting finds - Wikipedia

   en.wikipedia.org/wiki/List_of_metal_detecting_finds

   This is a list of historically significant items found by metal detecting method, only excluding magnet fishing finds, since magnet fishing is usually considered a distinctively different and separate hobby from traditional metal detecting.

6. Explosive detection - Wikipedia

   en.wikipedia.org/wiki/Explosive_detection

   Explosive detection. An U.S. Customs and Border Protection officer with an explosive-detection dog. Explosive detection is a non-destructive inspection process to determine whether a container contains explosive material. Explosive detection is commonly used at airports, ports and for border control .

7. Phase detector - Wikipedia

   en.wikipedia.org/wiki/Phase_detector

   A phase detector or phase comparator is a frequency mixer, analog multiplier or logic circuit that generates a signal which represents the difference in phase between two signal inputs. The phase detector is an essential element of the phase-locked loop (PLL). Detecting phase difference is important in other applications, such as motor control ...