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Please note : those sending "vcard.vcf" sig attachments - I have not been able to send the information through sowacs postings, and the sender's details are therefore not always clear. (I am obviously slipping up by not being vcard-friendly - can anyone advise me on this?) Bruce =============== Harry, Are you in the US? If so, get in touch with Jack Hillen. Go to the sowacs homepage, look at the list of probes there, (http://www.icfrnet.unp.ac.za/sowacs/heatdiss.html). Otherwise you can try jackh@fishnet.net. Gypsum blocks are pretty unreliable compared with some of the newer technology available. Jack's retailing waterwatchers for around the $US159 last time I looked. By the way, I don't make any money out of making the recommendation. It's just that when you find something good that works and is relatively inexpensive - use it. Cheers Brian.