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. > > ========================================================= > > > > ========================================================= > Important Subscriber Information: > > The Museum-L FAQ file is located at > http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed > information about the listserv commands by sending a one line e-mail > message to [log in to unmask] . The body of the message > should read "help" (without the quotes). > > 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). > ========================================================= Important Subscriber Information: The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes). 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).