The Metal Detector tool allows you to detect magnetic metals like iron. It's useful for finding dropped keys or knives. It cannot detect coins or jewelry.
Calibrating the metal detector improves the accuracy of readings. To calibrate:
The detector automatically calibrates when started.
The detector only finds magnetic metals like iron. To detect metal:
The graph shows magnetic field strength over time. Metal causes spikes up or down. If spikes occur that don't trigger the metal detector, lower the threshold to increase sensitivity.
Readings at the top of the screen show field strength in microteslas (uT).
Lower threshold values increase sensitivity. Higher values decrease it. Adjust with the on-screen slider.
This removes noise filtering for maximum sensitivity. The graph becomes noisier and false positives occur more frequently. Enable with the 'High sensitivity' switch.
Tapping the speaker icon in the top-right corner enables audio feedback. A tone will play when metal is detected, and the volume increases with field strength.
This experimental feature attempts to indicate metal direction with two on-screen dots. One points towards the metal and the other away from it. Unfortunately, it's uncertain which is which. Move your phone towards one dot; if the number in the center increases, you are getting closer. If the dots swap, it likely means you just passed over the metal. This requires a gyroscope sensor.
Enable it on 'Settings > Experimental > Show metal direction'.