Several people mentioned windchill as a possible effect with the reference temp. sensor in a hot-sensor anemometer. I was not aware that wind chill worked on dry objects (hence the theory behind wet-bulb/dry-bulb humidity sensors). Can someone please tell me why it is a consideration in this case? Are you concerned that water might condense onto the sensor? Sean | | Sean Breheny | Amateur Radio Callsign: KA3YXM | Electrical Engineering Student \--------------=---------------- Save lives, please look at http://www.all.org Personal page: http://www.people.cornell.edu/pages/shb7 mailto:shb7@cornell.edu ICQ #: 3329174 __________________________________________ NetZero - Defenders of the Free World Get your FREE Internet Access and Email at http://www.netzero.net/download/index.html