Tektronix 7403N Series Oscilloscopes

CRT Filter Blue For 7403N And More 7000 Series Oscilloscopes, Tektronix Part # 337-1700-01

CRT Filter Blue For 7403N And More 7000 Series Oscilloscopes, Tektronix Part # 337-1700-01

CRT Filter Dark Brown For 7403N And More 7000 Series Oscilloscopes, Tektronix Part # 337-1700-01

CRT Filter Amber ( Clear ) For 7403N And More 7000 Series Oscilloscopes, Tektronix Part # 378-0684-XX