Looking through the E-books & wanting to build an ammeter for special function, with regard to a shunt, reference is made to "milli-ohms"........ Is there any type of DMM on the market that will actually read with that degree of resolution ?? My Fluke 77 definitely won't do it......... I have several large pieces of compressed carbon, formerly vanes in a rotary vacuum pump, and a couple of other sources, suchas the positive post out of zinc-carbon batteries of various sizes, which should make excellent shunt material. Or am I better advised to use copper wire for shunts, a/w/a resistors, due to the math being there to work with ??