What is PEMF penetrative power and intensity

The intensity of a magnetic field decreases as the distance from its source increases, following the inverse-square principle.

Magnetic waves themselves can have extremely long wavelengths. That is why magnetic fluctuations from powerful natural sources — such as the Sun or the Earth’s core — can be detected over great distances.

However, when we talk about small but concentrated magnetic sources such as PEMF coils or permanent magnets, the effect is very localized. Even if the surface intensity is around 100–400 gauss at the coil or magnet, the strength drops rapidly as you move away. Just a few inches above the mat, the field becomes much weaker and may be close to background Earth magnetic levels (about 50–100 milligauss), often becoming undetectable with simple testers.