USAF-1951 Direct Read Resolution Target (T-21)

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T-21 has the traditional USAF-1951 spiral layout with improved labeling meeting the requirements as specified in MIL-STD-150A. The chart has DIRECT frequency Labeling in C/MM adjacent to their features. Thus no cross reference documentation is required to determine frequencies. The numeric labeling is enhanced and based on OCR-A extended font, to maximize recognizability.

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