@ timenutgoblin. I finally cobbled together a simple testing rig and had some success though I'm at the crawl stage of the crawl/walk/run process in understanding how all of this stuff works.
Just in case some other newbie is in the same predicament as I was before your advice and finds this thread, I have outlined my steps and attached some photos, all of which should be read in conjunction with our posts above:
1. Connected the tester's P1 clips to a 9V DC battery power source.
2. The tester's main module's POW (power) light lit up red and the display was back lit.
3. Touched the tester's two P2 clips together.
4. Display showed clips had R = 0.054 ohms.
5. Pressed the Mes/Cal switch.
6. Screen briefly flashed "CAL".
7. Display then showed clips had R = 0.000 ohms.
8. Connected the tester's P2 leads to a "1.5V" battery for testing.
9. Display showed battery had R = 0.172 ohms and 1.15V. (My Brymen showed battery was 1.149V).
It's likely some roughness in my testing process may cast some doubt as to the true accuracy of my results. I will refine my technique and tools.
Thank you for sticking with me while I sorted this out (to some degree, anyway
).
Regards,
Terry