Rummage Sale Finds - Three Multimeters, Triplett and Fluke

I ran across a church rummage sale a few days ago down in the Portland, OR area and spotted some old multimeters in the sea of stuff. A Triplett and two Flukes. I figured they wouldn't work but decided to get them anyway, just because they looked cool. This first photo is of the Triplett, a model 630-NA Type 4.

It's in surprisingly good condition for being 50 to 60 years old. Being this old, it's built like a tank. There are two batteries inside the case, a small No. 413 30-volt battery and a 1.5-volt D cell. I replaced the dead D cell and jumpered a wire between COM and V-Ohm-A and the meter's needle came to life. I was pleasantly surprised.

This writing is on the back: CCE Power Lab 806. I looked online and found Civil and Construction Engineering at Oregon State University, and Power Lab at Oregon Institute of Technology. This meter might have been at either of those institutions, or maybe from somewhere else.

The next item is a Fluke 8024A. It runs on a 9-volt battery. When I switch it on I can see that the segments have movement so the meter most likely still works, but the display is unfortunately unreadable.

The third meter is a Fluke 8050A. It runs on 120v AC but has an internal rechargeable battery pack (apparently optional). Unfortunately its display is also toast. Oh well, one out of three ain't bad. There are a few sites online that show how people have grafted in new displays on these meters but that's probably more than I want to take on.