Not often (okay, almost never) a capacitance substitution box would come in handy on the bench. Finally, the Amazon AI wizard suggested that at $14.99 we couldn't live life any longer without one.
From the pic above you can see that the included wire and alligator clip connector were replaced with banana plug jacks. It gives the rig and the bench a cleaner look.
The directions (which we folded up and placed inside the box for future generations) were straight forward and the values are accurate enough per a NIST traceable capacitance meter.
The same company also makes a resistance substitution box which we also don't need, but will probably build up anyway. Both are a nice, cheap, welcome convenience.