Physics Toolbox Magnetometer

Measure magnetic fields with your phone. Graph, record & export sensor data.

Measure, record, and analyze magnetic fields in real time using your phone’s built-in magnetometer. Physics Toolbox Magnetometer is a precise EMF and magnetic field meter trusted by students, teachers, engineers, and researchers worldwide.

Four Powerful View Modes

• Chart View

Live graph of magnetic field strength in microtesla (µT) over time across X, Y, Z axes and total magnitude.

• Multi Graph

Compare all axes simultaneously in a multi-panel display.

• Digital Readout

Clean numerical interface for precise real-time measurements.

• 3D Compass

Visualize magnetic field direction in three dimensions.

Advanced Data Tools

• Record and export data as CSV via email, Google Drive, or any sharing app

• Three signal filters: Kalman, Low Pass, and Moving Average

• Adjustable sample rate for slow or fast phenomena

• Switch between elapsed time and clock time on the x-axis

• Fullscreen graph view for detailed inspection

• Customizable plot line thickness

Classroom and Lab Ready

Designed for real scientific investigation. Use it to:

• Verify the inverse square law for a point source magnet

• Measure solenoid field strength as a function of current or coil geometry

• Detect the frequency of magnetically driven objects such as speakers or stirrers

• Map Earth’s background magnetic field

• Locate hidden permanent magnets or ferromagnetic materials

• Demonstrate electromagnetic induction concepts

Professional and Hobbyist Applications

• EMF detection and field mapping

• Speaker and motor diagnostics

• Geomagnetic surveys and field work

• Metal and magnet proximity sensing