Shot peening and other mechanical surface enhancement methods significantly improve the fatigue resistance and foreign-object damage tolerance of metallic components by introducing beneficial near-surface compressive residual stresses and hardening the surface.  However, the fatigue life improvement gained via surface enhancement is not explicitly accounted for in current engine component life prediction models because of the lack of accurate and reliable nondestructive methods that could verify the presence of compressive near-surface residual stresses in shot-peened hardware.  In light of its frequency-dependent penetration depth, the measurement of eddy current conductivity has been suggested as a possible means to allow the nondestructive evaluation of subsurface residual stresses in surface-treated components.  This technique is based on the so-called piezoresistive effect, i.e., the stress-dependence of electrical conductivity.  Previous experimental studies were conducted on excessively peened (Almen 10-16A) nickel-base superalloy specimens that exhibited harmful cold work in excess of 30% plastic strain.  Such high level of cold work causes thermo-mechanical relaxation at relatively modest operational temperatures; therefore the obtained results were not directly relevant to engine manufacturers and end users.  The main reason for choosing peening intensities in excess of recommended normal levels was that the eddy current penetration depth could not be decreased below 0.2 mm without conducting accurate measurements above 10 MHz, i.e., beyond the operational range of most commercially available eddy current instruments.  In this presentation we will report the development of a new high-frequency eddy current conductivity measuring system that offers an extended inspection frequency range up to 80 MHz with a single spiral coil.  In addition, the new system offers better reproducibility, accuracy, and measurement speed than the previously used conventional system.