详细介绍: 

 All bars and spaces are the same  as provided in the traditional USAF 1951 Test Target chart T-20 Meeting all requirements as specified in MIL-STD-150A.  The following improvements have been made:
- The chart has DIRECT frequency Labeling in C/MM.
- Numeric Labeling is enhanced and based on OCR-A extended font.
- Bars are laid out in two straight columns, for easier Scanning.
- Smaller elements have finder squares next to them to aid in determining their locations.

Overall Sizes: T-22 and T-22-2  is  4" x 4" (101.6 x 101.6mm)