I have a Micronta Digital multimeter, an older unit that I no longer have instructions for. The two ohm settings are indicated by "->/-" and "kohm". Which of these two do you use to check resistance with? The first one I get a 0 reading when touching the + and - probe together, but don't get a reading when checking resistance. The second setting, I get a 1.6 reading when touching the probes together. I get a 4.0 reading on the carto here. I assume that the KOHM setting is the one to use. I just need to subtract the 1.6 from the 4.0 to get resistance, altho that gives a 2.4 resistance, which I don't think is correct for a regular carto. The carto I am checking is a regular 808 carto. Thanks.