EMF Meter: Magnetometer Reader

Read the magnetic field around your phone as a live microtesla value from the built-in magnetometer.

EMFMeter shows the scalar field strength plus the three raw axis values, tracks the session peak, and plots a rolling 30-second chart so a magnet or speaker brought near the phone is visible as a spike, not only a number that briefly changed.

Key features
• Live field strength in microtesla (µT)
• X, Y, and Z axis values alongside the scalar magnitude
• Session peak with a one-tap reset
• Rolling 30-second history chart with Earth's typical ambient range as a visual band
• Honest disclaimer: this is a phone sensor readout, not a calibrated instrument

Useful for checking field changes near speakers or magnets, classroom electronics demos, and noticing a magnetic phone mount or case. Nearby metal and electronics, plus Earth's own field, all affect the reading.

A compact magnetometer reader for anyone who wants a clear number from the sensor they already have.