Penetration Depth

How far the coil's field reaches from the accessory before it fades to the reporting edge. The report measures this as the distance from the accessory surface to the furthest point the field stays above 5 Gauss, a measurement reference rather than a biological cutoff. At the low frequencies a PEMF device uses, the body is largely transparent to the magnetic field, so how far the field reaches is set by the coil's geometry and the strength of the pulse, not by the field pushing through a tissue barrier. The 3D field view shows the volume of space the field reaches above the accessory, with the 5 Gauss edge as its outer boundary and inner boundaries marking the strongest zones, each a fraction of the surface peak. The measurement is taken in open air directly above the accessory. A larger coil or a higher peak field keeps the field above a usable level farther from the surface.