500-series scopes

The 500 series of oscilloscopes from Tektronix includes:

• 531
• 532
• 533
• 535
• 536
• 541
• 543
• 544
• 545
• 546
• 547
• 549
• 551
• 555
• 556

These scopes take letter-series and 1-series plug-ins.