Spot probes are used for discovering flaws both on and below surfaces. Available in a broad frequency range, their diameters are usually large for accommodating lower frequencies or scanning large areas. Because spot probes contain large coil diameters the detectable flaw size is increased and is typically equal to one-half of the probe diameter.

Detachable surface probes are available in a variety of diameters and frequency ranges. They are shielded to provide maximum sensitivity and are used for crack detection, thickness measurement, and conductivity and coating thickness measurements. These probes include a Fischer/LEMO Triax or 7-pin LEMO Powerlink™ quick-release connector.

Corrosion probes (SPO-532x series) are specifically balanced to detect material loss in aluminum structures, and they are configured with reflection absolute coils.