newattitude 
Our old thermostat in the hall had a mercury switch. It was clear glass and you could see the mercury inside.
I've never seen a mercury switch on any of the computers, telephone systems or any circuit boards associated with either. I must say that I haven't been looking for them either.
This thread is one of the reasons why I don't depopulate circuit boards. I have no idea what might be inside some of the different components.
The last thing I need is mercury poisoning or to bust open something only to have some green flesh eating goo get on me.
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