On Mon, 14 May 2007 18:51:57 -0400, you wrote:

>>
>> I'm intrigued. So, how is the thing actually used? Once the bubble gets to
>> one side, the current stops?
>
>
>I don't think they have an output, or that anything actually happens at the end.
>They are mainly for logging power-on hours.

Things like these are pretty much obsolete as nowadays any pretty much any equipment that needs to
log power-on hours will have a processor and therefore be able to do it in software. And if not, a
low-end PIC etc. can do the job cheaply and easily. 



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