I know there are tons of temp sensors out there. Anyone have experience with them, got any ideas for me to use at clients? Cheap is good, but I don't want to skimp on features. Auto-emailing alerts is ...

I administer a rack of computers that's living in a server room here. The server room has a dozen or so racks in it and is (in theory) monitored by IT. I've installed Nagios to monitor various things ...