.....Thanks again for the additional info. and advice.
With the inputs from members I realize the meter is a "cheapy", but would still like to add it to my meter collection, with a copy of the original operator instructions if I can locate them. As mentioned in my earlier post, I'll be checking with Harbor Freight Co.. Naturally, the value of the meter doesn't warrant my spending too much time on this, but I'll give it a little work.
I'm not a professional electrician by any stretch of imagination. I took a home study electrical course years ago in small appliance repair and house wiring, which included building a tester with side by side analog volt/ohm and amp meters, from a kit. That course has paid for itself many times over during the years that followed and I get a lot of satisfaction being able to test and fix appliances and add electrical circuits to my home and relatives.
Currently, I rely mostly on my Radio Shack DMM, model 22-805. This is a 24 range meter, with a PC link and computer interface cable. It was a gift from my son and is really a bit of overkill for my modest needs, but I like it.
Andy in ATL
........Thanks for the safety advice. I'll certainly keep that in mind.
.......I was real curious as to the purpose of that little circular jack. Thanks much for the information !
The responses I've received from members here has been a great introduction for this newbie to the DIY forums....... I appreciate the help everybody !