77TH tracer & 200EP Inductive Amplifier & Harris TS224 Lineman Handset Untested

Description

I don’t know anything about these items, they were my uncle’s and he worked for a utility. I don’t know if they work or not.
I’ve listed the item names I see on the devices. There is also a bonus cord as seen in the picture. I don’t know what that is called.
77TH tracer & 200EP Inductive Amplifier & Harris TS224 Lineman Handset Untested.