Metal Detector is a free Android app developed by Daniel25 in the Utilities & Tools category. This app utilizes the magnetic field sensors on smartphones to detect metal objects. With Metal Detector, users can easily find invisible metal objects, such as pipes in walls or keys in sofas.

The app employs an algorithm that enhances the sensitivity of the smartphone's magnetic field sensor, providing better metal detection capabilities. Users can simply place their smartphones close to a wall and move it along to generate visual and auditory signals in response to various metal objects, including pipes and rebars.

Metal Detector also offers a visual detection function using the phone's camera, allowing users to conveniently detect metal while watching the camera's video feed. This app is not only useful for entertainment purposes, but it can also assist in identifying any metal object in the vicinity.

For example, at home, Metal Detector can be used to find lost metal objects like keys or jewelry that may have fallen under furniture or in hard-to-reach places. It can also be utilized to detect metal in walls before drilling.

The app provides three types of metal detectors, which users can choose from the main menu. It is important to note that Metal Detector is more sensitive to iron-rich substances and may have difficulty detecting coins, gold, and silver due to the device's magnetic sensor.

Metal Detector is a handy tool for those who want to detect metal objects using their smartphones. It offers convenience, accuracy, and a variety of detection options. Please note that this app uses GraphView and SpeedView, which are licensed under the Apache License Version 2.0.