Every point where Gauss Labs measured the field of each common coil type, drawn where it sits on the coil. Pick a coil type, then click or tap a layer in the stack beside the picture to see the points measured at that distance from the surface. Hover over a point, or slide a finger across the points, to read its Gauss value. Every layer is colored on one scale, so a layer farther from the surface reads cooler. The mat's values are generated from its coil layout; the loop, pancake and donut are real measurements.

A ring of wire. The readings are strongest along the ring itself and lower in the open center.