[Heathkit] Heathkit Model MM-1

[Receiver]

I bought the remains of an equipment donation from a Ham estate to a boy scout troop some time ago.  I'm now getting down to checking out the smaller pieces.  This is a Model No. MM-1, Series No. 751 1128.  It is a multimeter 5K/vac and 20K/vdc similar in form to many simpson, triplett and others.  This one seems to be a keeper.  I have checked the Bama site, but no manual or information for the MM-1 there.

Can anyone help with this?

All help or pointers much appreciated.....John, W4NET