Many manufacturers of climate data loggers advertise on internet. I mention here only specialised items that are not so easy to recognise while browsing.

Fine thermocouple wire: Omega Corporation, PO Box 2721, One Omega Drive, Stamford CT 06906 USA, Fax: +1 203 359 7807.

Resistive RH sensors that can be bought as separate items, without electronics:
General Eastern, 20 Commerce Way, Woburn, MA 01801 USA Fax: +1 617 938 1071
Phys-Chem Scientific Corp. 36 West 20th St. NY NY 10011 Fax: +1 212 243 7352.

Blue Wool Standards are obtainable from national standards organisations or their agents.

Technical information on sensors and their installation:
Omega handbook (reference above)
Moisture and Humidity 1985. ISBN 0-87664-865-0, Instrument Society of America.
This is the proceedings of the last international gathering of humidity experts. The next will be in 1998.


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