I concur that Hobos are great loggers.  A word of caution though.  You  
should carefully read the specifications & sensitivity ranges for the  
loggers to be sure they suit your application.  For example, some  
loggers do not record in the really low end of RH - if you get really  
low levels & want accurate readings then you should choose your logger  
accordingly.  Also, for outdoor use - there are only a few - the  
HoboPro (white, about the size of a hockey puck) & the pendant loggers  
(read light intensity & temperature) are designed to go out of doors.

Susan Maltby, Conservator
Maltby & Associates Inc.
Adjunct Faculty, Museum Studies Programme/FIS
University of Toronto

Quoting "Meredith L. Dunham" <[log in to unmask]>:

> We use three different types of HOBO loggers (door, soil, temp/RH)   
> and they all work very well.  They're easy to download, print   
> immediate graphs or data lists (from a computer loaded with the   
> appropriate software), and the data can be converted to an Excel   
> format for other purposes.  We placed the loggers outside, inside,   
> in cases, in fireplace flues, in attics, and just about anywhere you  
>  could want them.  And they don't need batteries that often.  If you  
>  go with the shuttle off-load method, I have easily downloaded   
> between 8 and 12 loggers with a month's worth of data and   
> transferred it our computer.  And they really do give you an   
> easy-to-understand look at your environment.
>
> Meredith Dunham
> Curatorial Assistant
>
> Virginia Beach Historic Houses
> 3131 Virginia Beach Blvd.
> Virginia Beach, VA 23452
> Phone: 757-431-4000
> Fax: 757-431-3733
> Email: [log in to unmask]
>
> ________________________________
>
> From: Museum discussion list on behalf of Sue Frank
> Sent: Wed 1/10/2007 2:14 PM
> To: [log in to unmask]
> Subject: [MUSEUM-L] HOBO Hygrothermographs
>
>
>
> Can someone bring me up-to-speed about HOBO hygrothermographs?  We
> don't use these at the Phillips Collection, but I know other museums use
> them.  Are these more accurate than the paper recording units?  Is it correct
> that you don't have to calibrate them monthly?  How often do you have to
> calibrate them?  Thanks.
>
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If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).