Best Metal Detector is a great Android app for detecting metals in your surroundings. It uses your device's built-in magnetic sensor and shows the level of the magnetic field in microtesla.

You might use it to find electrical wires in walls, pipes, and stud finders. You can use Best Metal Detector as a ghost-hunting device! However, the accuracy of the tool depends entirely on the sensor built into your mobile device. If you decide to download this app, bear in mind that it can't detect copper coins, gold, and silver.