Searching the play store for
emf detector shows a bunch of apps that can measure the electromagnetic radiation level and they do seem to somehow work.
What is the operating principle behind these apps and what kind of sensors are they using?
What level of accuracy these sensors provide and how do they compare to dedicated EMF detectors which sell online starting with ~$7?
In the Android docs I see:
SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED — can these possibly be used to measure EMF radiation levels and if so then which ranges are supported?
- This question suggests that Android phones might be able to measure magnetic fields: https://skeptics.stackexchange.com/questions/6961/can-smartphone-apps-detect-emf