I have an old multimeter, a Metrix MX 001B. I believe this was made sometime in the 1970s. by a French company, Metrix, now Chauvin Arnoux Metrix. This had been gathering dust in the garage for several years until I started working on my Robot Arm Controller project.
The sensor wasn't working on one of the channels so I wanted to use the multimeter to test the circuit. Needless to say, when I dusted it off and tried to use it, nothing happened.
First, it needed two 2x LR1 Size-N batteries (duh!).
Second and more serious, the connection to the negative battery terminal had snapped off. Fortunately, it was relatively simple to solder a new connection onto the board.
And here it is working.
Not perhaps the most exciting video in the world!
(Uploaded to Blogger instead of YouTube so this isn't high definition. You have to kind of imagine seeing the needle move.)
Update 4th Jan 2016
In response to Halil Karakose's comment, I thought I'd include a view of the inside. This is all wonderfully simple and at a human scale compared to some modern circuits!
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