OK, glad to help! That one seems to be one of the better combination-type testers. It can be used to check out charging systems, either generator or alternator type, and the "low volts" scale will be useful for finding high-resistance connections in a starting circuit. By placing the voltmeter leads across a battery cable connection like from a battery post to the cable clamp that attaches to it, then cranking the engine, the "voltage drop" across that connection can be measured. By checking every connection that way, a bad cable or a high-resistance connection can be isolated. The maximum voltage drop across a connection on a 12 volt system is 2/10 volt, and zero voltage drop from one end to another of a cable. That's about the only way I know of to find a cable that's corroded internally. Doing those tests on a 6 volt system can cure slow-crank problems. On a 6 volt setup, the max drop across a connection is 1/10 volt.
Jerry
