ESR meter: Looks OK

I hate to admit it, but my problem was simply poor connections! When I tied the wires together with a wirenut, the reading was rock stable. I had a HELL of a time making the probes. Getting the wire to solder to the plugs wasn't easy. And I get 0.23 resistance reading across them, at best. I'm looking forward to actually trying it out! What are the PCB pins for? I couldn't find any reference to them nor make a wild guess.