: Genuine "metal detector" apps on Android use the phone's built-in magnetometer (magnetic field sensor). These only work for ferromagnetic metals (like iron or steel) at very close range—usually just a few inches from the device.
Practical checklist before using or recommending a “satellite metal scan” Android app
Then pair with a (Nokta, Minelab, Garrett). The satellite part helps you choose where to walk — not what’s under your feet instantly.
) into digital meters, graphs, or camera overlays to show when you are near metal. Limitations: