Carefully machined flaw samples in plates and tubes were examined with eddy-current coils of accurately known dimensions. Both near- and far-side flaws were measured using absolute and differential coil modes. The experimental data were compared with computer calculations based on the flaw theory of Burrows and the analytical solutions of Dodd and Deeds. The experimental and theoretical data are in good agreement whenever the flaw size is small compared to the other significant dimensions, but large enough to give a reasonable signal-to-noise ratio for the measuring instrument. The experimental and analytical readings are also used to check our flaw inversion theory.