On Sep 4, 1:30 am, Chuck Harris wrote:

HP410LR? That's a new one to me. I am aware of the 410A, 410B, and 410C,
but not the LR. The 410(A,B,C) have their DC/Ohms probes wired directly to
the instrument, and their AC probe has a vacuum tube diode in it, and plugs
in by way of a Stereo Phone Plug.

Can you describe this instrument for us?

-Chuck

Sorry, it's a HP 400LR, a rack mount version of the 400L.

My unit has binding posts.