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{{TM500 | mfg=Tektronix | type=DC503A | function=125 MHz, 7-digit frequency counter | class=counter | image= | {{TM500 | mfg=Tektronix | type=DC503A | function=125 MHz, 7-digit frequency counter | class=counter | image=dc503a.jpg | introduced=1981 | discontinued=1993 | ||
|designers=Roland Crop;Jim Geddes | |designers=Roland Crop;Jim Geddes | ||
|manuals= | |manuals= |