Tesoro Metal Detector 10"x12" Concentric uMax Coil

The 9 x 8 and the 12 x 10 are spoked coils that use Sinusoidal Technology. This technology creates a detection bubble that works from the center of the coil to beyond its edges. These coils produce an infinite number of electromagnetic flux lines, which surround the coil and penetrate deep into the ground. As targets pass through the bubble, they start interfering with or breaking the flux lines. The detector reads the interruption of flux lines and a signal is produced. When you saturate the ground with these flux lines, you?re guaranteed better sensitivity to smaller targets and more depth on larger targets.