> every 15 minutes. If they go outside a preset range, an alarm goes off. 
> How much would *you* suggest such a system costs?

Depends on far more than just the raw technical performance.

If I'm going to use it check the temperature in my greenhouse, I would 
imagine a 50 quid jobby from Maplins would do with some cheap hacked 
together Win3.1 program.  However, if I'm putting it in a manned spacecraft 
that is orbiting the moon, I would expect way higher performance, and an 
equally higher price.

BTW, the stuff we make here, we always have to put on the 1st page of the 
specification that it is not to be used in anything critical, like plane 
instruments, hospital equipment, traffic signals etc, simply because we 
don't design or test to high enough standards.  If we did, the cost would be 
astronomical, for stuff like PC monitors you don't need that level of 
reliability so you get them very cheap.

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