A-scan shown on bright, 5.7 in. electroluminescent display of Sonic Model 1000PG helps operator verify readings taken on curved surfaces, and from difficult materials like Inconel, Titanium, glass, and composites. Gauge measures thickness ranging from 0.004-10 in. from single side of testpiece. It accepts delay line, pencil tip, and contact transducers. Operator can select among 5, 10, and 15 MHz narrow-band tuned settings.