For your info Sharon, (and others on the list) Hoskin Scientific in
Burlington , sells,services and calebrates recording hygrothermographs.
Their address is 4210 Morris Drive, Burlington, Ontario L7L 5L6.  Tel:
(905) 333-5510; Fax (905) 333-4976.   The rep I deal with is very good,
his name is Bill Ramshaw.

Iona McCraith
Head Conservator, Archives of Ontario
Tel: (416) 327-1521        Fax: (416) 327-1999
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