Penetration Depth

How far the coil's field reaches from the accessory before it fades to the reporting edge. At the low frequencies PEMF devices use, the body is largely transparent to the magnetic field. So the reach is set by the coil's size and the strength of the pulse, and a larger coil or a stronger pulse keeps the field at a usable level farther from the surface. Gauss Labs measures it in open air directly above the accessory, as the distance from the surface to the farthest point where the field stays above 5 Gauss (a measurement reference, not a biological cutoff). A second figure, penetration to 10% of peak, is the distance at which the field falls to a tenth of its strength at the surface. The 3D field view shows the space the field reaches, with the 5 Gauss edge as its outer boundary.