Having just been through 24xx calib. I can summarize as requiring : TG501 Time mark generator PG506 Calibration generator TM500 Mainframe Tunnel diode pulser and a variety of generic tools: 400MHz bench scope DMM Various high quality (and short) bnc cables and connectors 5x, -14dB attenuator Ceramic alignment tools, straight and phillips and 1 tiny one. Linear power supply Sine-wave gen <= 2MHz