: Most functional "metal detector" apps for Android, such as those from Smart Tools co. , utilize your phone’s built-in magnetometer sensor. These can detect ferromagnetic metals (like iron or steel) within a few centimeters of the device but cannot find non-ferrous metals like gold or silver. The Reality of Satellite Mineral Mapping
These will only detect metals within 2–4 inches of your phone. They are not "satellite scanners."
A: For hobbyists, Metal Detector by E3S is simple and free. For science, Physics Toolbox Magnetometer provides raw data (in microteslas). Pair these with a physical search coil if you are serious about prospecting.
