many years ago...sometime in the '70s or early '80s I think...I built a milliohmeter project from an article in a magizine. Pretty shure it was Popular electronics. Used it for awhile and stowed it away and forgot about it for a long time. Needed it the other day and dug it out, but I've forgotten how to calibrate it. It was a rather involved zeroing process which I had typed out on a label and affixed to the case, but alas a hungry mouse ate the instructions and now I have neither the instructions or the schematic. Anybody remember such an article??? I tried looking for Popular Electronics archives but had no luck....probably because I'm such a dummy when it comes to computer usage.
I do remember a project like that and recall it used a 6 volt regulator (7806). I actally purchased some of the parts but never got to build it. I might have the article put away somewhere - I'll take a look sometime on the weekend.
I also googled on milliohm adapter and found some things - including a magazine article that appears to recent to be what you and I might recall but the search might turn up what you want.
The milliohmeter project I,m looking for had no active components (transistors, voltage regulators ect) strictly resistors, pots, switches and a one milliamp meter. It measured one ohm full scale or point-one ohm full scale.