The unique aspect of the UltraSpec® device is the use of a wide frequency range when interrogating a material. When coupled with specialized data analysis software, this produces a highly sensitive NDI technique that can be employed for challenging inspection applications. UltraSpec® uses a long-duration, swept-frequency excitation pulse in contrast to the short duration, large amplitude excitation pulses used in traditional ultrasonic methods. The technique offers substantial signal-to-noise improvement and can be efficiently tailored to application-specific frequency ranges to maximize sensitivity and fidelity. Spectral analysis, resonance characteristics and processed time reflections provide the user with more information to assess the structure being inspected. The system also allows for focused inspections at different depths or critical material interface regions within a complex stack-up. This is especially useful for bond inspections, porosity detection/quantification, identification of micro-cracking and impact damage in composite materials, characterization of material properties, and improved signal penetration through specialty coatings and in highly attenuative structures. The technique has been used to successfully produce material insights that cannot be provided by other methods. This paper will use results from challenging inspections to highlight these unique UltraSpec® capabilities and advantages. It will also present the latest hardware and software improvements added to maximize inspection accuracy and throughput.