Hand Held Metal Detector and is utilizing iPhone/iPad magnetometer full capabilities. Using this detector you'll easily identify ferromagnetic metal objects (steel, iron, gold, pure silver).
In short, yes, they work. Many Android apps come equipped with a magnetometer. It's mostly used for stuff like GPS or part of the compass functionality. However, it is also capable of detecting metal.
Goldmeter - real gold detector on the App Store.
How to Do the Float Test to Check If Gold is Real. Fill a cup or bowl with water and carefully drop your gold piece into it. If the gold is real, it will sink to the bottom of the cup. If it's fake, it will float to the top or hover in the middle of the cup.
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With an Android app called Metal Detector (by Smart Tools), you can turn your Android phone into a metal detector. Using the app might just help you find those small metal objects before you accidentally step on them or before they get sucked up into your vacuum cleaner.
The sensor is located towards the top right hand corner of the device, and measures fields within a ±2 gauss (200 microtesla) range, and is sensitive to magnetic fields of less than 100 microgauss (0.01 microtesla).
If you use an iPhone, an REE called lanthanum helps make sure the screen has a vivid color pop, while neodymium and dysprosium are credited for helping the device vibrate, among other uses. In electric cars, magnets, which are used to help power the vehicle, rely heavily on rare earths such as neodymium.
Metal Detector is an Android application that detects the presence of metal nearby by measuring the magnetic field value. This useful tool uses the magnetic sensor built into your mobile device and shows the magnetic field level in μT (microtesla).
A metal detector detects metal (usually by generating an electromagnetic field which is then absorbed/re-radiated by the metal). Mobile phones contain metal parts in the electronics, screws, antennas, case, printed circuit boards etc. Therefore they would be detected by a metal detector.
For those metal detectorist who use Android or iPhones phones do you know there is a free app called Google Lens to help you identify detecting finds? Google Lens app is an AI-powered technology that uses your smartphone camera and deep machine learning to detect an object in front of the camera lens.
Amazon.com : Metal Detector Gold Finder Underground Metal Scanner with High Definition Screen for Gold Silver Copper AC100‑240V(US Plug) : Patio, Lawn & Garden.
Vinegar Test
This test simply requires that a few drops of vinegar be applied to the metal, hopefully in an inconspicuous place. If the metal is real gold there will be no change. If the metal is fake gold it will change color.
There is actual gold in your phone, used because of its excellent conductivity and resistance to corrosion. However, the amount of gold contained in a phone is smaller than one might expect. On average, a smartphone might have around 0.034 grams of gold.
Masking Gold Signals with Iron
But it is one of the best metals to set off a metal detector. So, if a gold nugget has a large amount of iron near it, the iron will mask its signal. As a result, the metal detector will not detect the gold buried underground.
Inductive proximity sensors can only detect metal targets. They do not detect non-metal targets such as plastic, wood, paper, and ceramic. Unlike photoelectric sensors, this allows a inductive proximity sensors to detect a metal object through opaque plastic.
Metal detectors can detect both ferrous and non-ferrous metal types, although they detect ferrous metals more easily due to their magnetic properties. Ferrous metal contains iron and is often magnetic, while non-ferrous metal consists of other elements like nickel, aluminum, and zinc.