Using Smartphone Apps for Low-Frequency Magnetic Field Detection
Most smartphones are equipped with a magnetometer, primarily intended for compass functionality. Some free apps can access this sensor to display magnetic field strength in microTesla (µT) or milliGauss (mG). While these apps are not as sensitive or accurate as dedicated meters, they can provide a basic indication of PEMF device operation.
Recommended Free Apps to Try
| Platform | App Name | Free | Download Link |
|---|---|---|---|
| Android | Physics Toolbox Magnetometer (by Vieyra Software) | Yes. | Google Play |
| Android | Ultimate EMF Detector (by MRE Programming) | Yes. Paid version available. | Google Play |
| iOS | EMF Analytics (by SpiritShack Ltd) | Yes. Pro/Paid version available. | App Store |
How to Use:
- Place your phone near the PEMF applicator or coil. For iMRS system, set intensity to 400% to maximize the signal pick-up.
- Observe the baseline reading with the device off.
- Turn on the PEMF device and look for a change in the magnetic field reading.
- A significant increase indicates the device is emitting a pulsed magnetic field.
Limitations:
- DO NOT USE IF YOUR PEMF DEVICE IS RATED 100 Gauss (or 10mT) or more, as the magnetic field could damage your smartphone or tablet.
- Smartphone magnetometers are optimized for static (DC) fields and may not accurately capture fast-changing or very low-frequency AC fields typical of PEMF devices.
- Sensitivity is limited; weak fields or high-frequency pulses may not register.
- Cannot provide precise frequency analysis, since the sampling frequency typically is between 10-100Hz. PEMF devices usually have base frequencies running at much higher range (Khz – Mhz range)
Best Practices for PEMF Device Signal Detection
- Use a controlled environment: Remove other sources of magnetic interference.
- Test with device on and off: Compare readings to confirm the PEMF device is the source.
- For research or clinical validation: Use a dedicated ELF magnetic field meter for reliable results.
Recommendation
- For basic home verification:
Use a free magnetometer app These apps are easy to use and can confirm if your PEMF device is emitting a detectable magnetic field. - For more accurate measurement and research:
Invest in a dedicated low-frequency magnetic field meter capable of measuring ELF/VLF fields in microTesla or Gauss. This is essential for precise validation of PEMF device output and compliance with therapeutic standards. However a lab ready device could cost thousands of dollars. A general purpose 3-axis Alphalab Trifield EMF Meter Model TF2 can be a good choice for a more responsive detection of the magnetic field.
Low-frequency magnetic field detection is the most relevant method for verifying PEMF device signals. While free smartphone apps offer a convenient way to check for basic device operation, their limitations mean they are best suited for simple, non-critical validation. For accurate and reliable measurement—especially in clinical or research settings—a dedicated ELF magnetic field meter is recommended.