Please note that computer data loggers _do_ need to be recalibrate  
every few years - by the manufacturer.

Sue Maltby, Conservator
Maltby & Associates Inc.
Adjunct Faculty, Museum Studies Programme/FIS
University of Toronto
416-921-2877

Quoting Mark Janzen <[log in to unmask]>:

>
> Hi Tracy,
>
> We just did exactly that. We replaced our old and in-need-of-calibration
> hygros with digital versions(HOBO U10s). They work very well, the software
> is easy to use, and they do not need calibration. I do keep my old hygros
> out for display purposes, but I do not worry about keeping the graphs, if I
> even have them turned on. Lots of visitors see them and wonder about them,
> giving us a good opportunity to explain that element of environmental
> control. The new digital versions are largely invisible(dependent upon
> placement). Most people think they are thermostats.
>
> Good luck.
>
> Mark Janzen
> Registrar/Collections Manager
> Edwin A. Ulrich Museum of Art
> Martin H. Bush Outdoor Sculpture Collection
> Wichita State University
> (316)978-5850
>
>
> I don't know if this question has been posed before and I am sorry if this
> is a repeat.  I was wondering if anyone uses digital data loggers as
> opposed to pen/drum hygrothermographs.  My museum is looking into possible
> changing out the old hygrothermographs for something a little easier to
> manage and calibrate but can also keep day to day records.  Does anyone
> have any opinions and/or suggestions?
>
> Tracy
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