Magnetic Sensor

Magnetic Sensor turns your phone's built-in magnetometer into three precise tools:

• Compass — A live, tilt-compensated compass with cardinal direction (N/E/S/W) and adjustable magnetic declination so the needle points to true north, not just magnetic north.

• Metal Detector — Set a baseline reading anywhere, choose Low/Med/High sensitivity, and feel haptic pulses that get stronger as the field deviates. Perfect for finding studs in a wall, screws under drywall, or rebar in concrete.

• Field Logger — Record samples at up to 60 Hz, then export to CSV via the share sheet. Saved recordings stay in the app for replay or re-export.

KEY FEATURES

• Live X / Y / Z axis readings + total field magnitude

• Tilt-compensated heading using the accelerometer

• Magnitude history sparkline + multi-channel chart

• Rolling statistics: mean, standard deviation, RMS, range

• Figure-8 calibration helper with quality indicator

• Min / Max tracking with one-tap reset

• Three sample rates: Slow (500 ms), Normal (100 ms), Fast (16 ms)

• Light / Dark / System theme

• English and Korean

• Unit options: μT, mGauss, nT

• Adjustable smoothing

• Magnetic declination presets

• Haptic alerts for the detector

• Keep-screen-awake while recording

• CSV export with full timestamp + per-axis data

PRIVACY

All sensor data is processed on-device and never leaves your phone. The app does not collect location, contacts, or personal information. Anonymous mobile advertising is used to keep the app free; you can watch a rewarded ad to unlock unlimited CSV sharing for the session.

WHO IT'S FOR

• Hobbyists exploring magnetic fields

• DIYers detecting screws, studs, and rebar

• Students collecting data for physics or geology projects

• Hikers wanting a reliable phone compass

• Anyone curious about the invisible field around them

REQUIREMENTS

A device with a magnetometer (most phones built since ~2013). The app cannot work on devices without one — it will tell you on launch.