Here's a Heathkit IM-17 Volt-Ohm Meter that I built back when I was in high school, around 1973. It originally required a C cell and a 8.4V Mercury battery (no longer available) so I modified it for a standard 9V alkaline. Re-aligned it and put it back into service.

http://www.videokarma.org/attachment.php?attachmentid=175997&d=1346520931
http://videokarma.org/attachment.php?attachmentid=175995&d=1346520931
http://videokarma.org/attachment.php?attachmentid=175996&d=1346520931
http://videokarma.org/attachment.php?attachmentid=175998&d=1346520931

Kinda cool to still use stuff that we had many years ago isn't it! I just found my HH Scott LT-112B tuner that I made in 1967. It looks like new and has the walnut case. Hope to put it back into the flock soon. And my dad's Heathkit stuff is still around on my workbench. He would be proud...

Here's a Heathkit IM-17 Volt-Ohm Meter that I built back when I was in high school, around 1973. It originally required a C cell and a 8.4V Mercury battery (no longer available) so I modified it for a standard 9V alkaline. Re-aligned it and put it back into service.

http://www.videokarma.org/attachment.php?attachmentid=175997&d=1346520931

I see you take good care of your equipment. You did a great job of building it as well. It looks like it was a good buy, at the time. You couldn't buy much for twenty dollars, even back in 1973.
I still have Knight-kit equipment, I built in the early 60's. It still works well.

That looks real good, is it all battery-powered?

I have a Heathkit IM-18 VTVM I built in 1975 that looks very different. Got beat up and used hard, now I need the meter for it.

Yes, I used a diode in series with the 9 volt battery lead to drop the voltage down a bit.

Here's another one...this one was built in 1978...it's an IG-5282 audio generator that runs on two 9 volt batteries.
After all of these years, it still produces a near perfect sine-wave!

http://videokarma.org/attachment.php?attachmentid=184084&stc=1&d=1409013535
http://videokarma.org/attachment.php?attachmentid=184085&stc=1&d=1409013535

Looks like you have the dual channel version of my better scope.

The silly-scope was borrowed. :)

You're the second person I've encountered that calls them silly-scopes.

Looks like the sinewave is slightly clipped on the positive side. IIRC, those things would clip asymmetrically when one of the batteries would start to go flat. The 2 9V batteries are configured as a +/- 9V bipolar supply.

My first "real" set of test gear was the full set of 5280 series Heathkits which I put together while I was in high school. There were AF and RF signal generators, an RCL bridge, a signal tracer, and a FET input VOM. The whole set could be powered from an optional AC power supply to eliminate all the 9V batteries.