Described in ASTM E2737, but also for special inspection set-up dimensions, only.

Two flat plates made of the material used in the application or of the most stringent material, and with the thickness suitable to the object to be inspected: Bottom Plate Top Plate, half size of Bottom Plate.

Duplex Plate Phantom - set-up

Duplex Wire Type IQI - ASTM E2002/ ISO 19232-5