Try the Honeywell HIH3605 - mind you it is an expensive beasty but it gives you what you're looking for. I'm looking at using a device from IST but have to do the interface stuff myself - so if anyone out there has some experience to share I'd appreciate it. John -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu