aye, an automotive tester indeed. You wouldn't get dwell or RPM functions in your typical multimeter. These were something of a does it all device, capable of testing starter and alternator currents, diode tests for rebuilding alternators, voltage and ohm checks for electrical system troubleshooting, rpm and dwell for tune-up purposes. The "dwell" refers to the number of degrees of crankshaft rotation that the points were shut.