If the app supports satellite overlays, drop a pin whenever the µT level exceeds 60-70. Conclusion
These are on your phone. They require data processing in GIS software (QGIS, ArcGIS).
in my wall and it accurately spiked whenever I passed over a nail. Simple Interface: Easy-to-read digital meter showing microtesla (µT) levels. Calibration: Simple "figure-8" motion to reset the sensor.