Metal Detector: EMF Gauge

Turn your phone into a metal detector. Metal Detector reads your phone's built-in magnetic sensor and shows nearby metal on a big analog gauge — the needle climbs, the beeping speeds up, and the phone vibrates harder as you get closer.

Sweep your phone slowly over a surface. When metal comes near, the magnetic field around it is disturbed, the needle jumps, and a large METAL DETECTED alert appears on screen.

KEY FEATURES
▸ Large analog gauge with a smooth moving needle
▸ Beeping that speeds up as the signal gets stronger (Geiger-counter style)
▸ Vibration feedback that grows with the signal
▸ One-tap calibration to zero out the background field
▸ Sensitivity slider — from strong metal only to fine wires and small nails
▸ Signal levels: Weak, Normal, Strong and Very Strong
▸ Detection log — your last 50 finds with time, peak µT and your own labels (stud, nail, pipe…)
▸ Built-in "What can it detect?" guide: iron, steel and magnets respond most strongly; gold, silver, copper and aluminum barely register
▸ Field strength in µT for those who want the raw number
▸ Light and dark themes

WHAT PEOPLE USE IT FOR
▸ Fun magnet and iron experiments at home or in class
▸ Camping and outdoor trips
▸ Finding nails, screws and steel studs behind drywall
▸ Checking whether a lost key ring or tool with steel parts is nearby
▸ Playing detective with the kids
▸ Satisfying plain curiosity about what is hidden nearby

CALIBRATION MAKES IT WORK
Hold the phone still, away from metal, and tap Calibrate. That sets the current magnetic field as your zero point, so the Earth's own field and any fixed metal nearby are cancelled out. Only new, local disturbances register as a signal. Recalibrate whenever you move to a new spot.

PRIVATE BY DESIGN
Everything runs on your device. No location is collected, nothing is uploaded, and no internet connection is required to detect.

IMPORTANT — HOW IT WORKS
Metal Detector estimates nearby metal using your phone's built-in magnetic (magnetometer) sensor. It detects changes in the magnetic field and cannot replace a professional VLF/PI metal detector. Readings are affected by speakers, magnetic cases, other electronics and vehicles, and non-magnetic metals such as stainless steel and aluminum may respond weakly or not at all. Sensor quality varies between phone models.

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