Tek calibration fixtures
Tektronix made a lot of fixtures that were made for scope calibration purpose. Here you see a 1000:1 resistive divider that could be used for things like calibrating a uV plugin.
1000:1 divider
The second is a (broken) TU-5 pulser. This was used for the %XX series scope plugins like the 1A4. It should give a 1 ns pulse. You connect it to the amplitude calibrator off the mainframe and the slowly turn the potentiometer (on the other side) until it starts to pulse.
TU-5 pulser adapter
This is an adapter you need when you want to use the TU-5 with a 105 pulser
TU-5 pulser
The last one is a 067-0681-01 very fast tunneldiode pulser. It has a Tr that is better as 350 ps. The operation is the same as for the TU-5. I have no documentation about it.