Wall Scanner & Metal Detector

Wall scanner with magnetometer. Find iron studs, pipes, wires, EMF behind walls.

A real wall scanner using your phone's magnetometer. Find iron studs, steel pipes, wires, and rebar behind drywall. No ads. No tracking. No accounts. Fully offline.

MetalHunt is a metal detector and stud finder that turns your phone's built-in magnetometer into a real microtesla readout. When iron or steel comes near the phone, the magnetic field bends and you see exactly how much, in real time. No fake gauges. No fabricated gold detection. Just honest physics.

USES

* Stud finder mode for locating iron studs and steel framing in walls
* Wall scanner for finding pipes, wires, and rebar behind drywall and concrete
* Metal detector for nails, screws, bolts, hidden hardware
* EMF scanner to measure electromagnetic fields from motors, microwaves, transformers
* Magnetometer raw readout for makers, students, and physics curiosity

WHAT THE METAL DETECTOR FINDS

* Iron studs and steel framing in walls
* Iron pipes and rebar behind drywall and concrete
* Nails, screws, bolts, drywall anchors with iron content
* Keys, buckles, magnets, ferrous tools
* Strong electromagnetic fields (EMF) from microwaves, motors, transformers

WHAT THE METAL DETECTOR CANNOT FIND

The phone magnetometer reacts only to ferromagnetic materials: iron, steel, nickel. It cannot find:

* Gold, silver, copper, aluminium, brass — non-ferrous, no magnetic signal
* Plastic, wood, glass, ceramic
* Buried objects more than 5 to 25 cm away — phone magnetometer reach is limited

These limits come from how magnetometer sensors work. They detect changes in magnetic field strength, which only ferromagnetic metals produce.

DETECTION MODES

* Stud Finder — wall scanning, threshold 6 microtesla, continuous tone
* Metal Finder — general use, threshold 10 microtesla, fast response
* EMF Scanner — weak field detection with X/Y/Z axis readout
* Raw Data — full debug magnetometer output for makers, students, physicists

FEATURES

* Live magnetic field readout in microtesla
* Figure-8 calibration with hard-iron and soft-iron correction
* Adjustable sensitivity per mode
* Audio beep and haptic vibration alert on detection
* Session recording with full graph view
* CSV export of magnetometer data
* X/Y/Z axis debug readout for raw sensor analysis
* Saturation warning for magnetic phone cases (MagSafe, refrigerator-strength magnets)
* Reference values for common objects and the Earth's magnetic field
* Material You theming and dark mode
* Full accessibility support including TalkBack

HOW IT WORKS

Every modern Android phone has a built-in magnetometer chip — the same sensor that powers your compass app. It reads the Earth's magnetic field, about 49 microtesla in central Europe. When iron or steel comes close, the field bends. MetalHunt shows you exactly how much, in real time, with a smoothed display and proper figure-8 calibration.

Aluminium, copper, gold, and silver do not bend a magnetic field — that is a property of the materials, not a software limitation.

PRIVACY AND PERMISSIONS

MetalHunt requests only the VIBRATE permission. No internet permission. No location. No camera. No microphone. No storage beyond your local session data.

* No analytics SDK
* No advertising ID
* No tracker libraries
* No user accounts
* No internet requests at runtime
* All session data stays on your device

You can delete every byte of stored data with one tap in Settings.

NO ADS

MetalHunt has no banner ads, no interstitials, no rewarded ads, no paid upgrades, and no subscriptions. Every feature is free.


Support: tom@lapnito.cz