Hello Gents, I've recently become aware of an O2 saturation measuring device used by hospitals...it appears to use two led's on the top and bottom of the index finger, which then measures heart pulse and O2 saturation, anyone know how this works? and can it be done with a pic? tia -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body