I was told that sling psychrometers measured your sweat better than it measured the surrounding environment. For those of you with small budgets and lots of spaces to measure, why stick with the hydrothermagraphs that are hard to move and need to be recallibrated every time you do? We have two dataloggers and have a rotating schedule of two weeks to one month to measure exhibit spaces and storage spaces in five different buildings. Recently conservators checked an exhibit case to make sure the RH was low enough to stop a meteorite from rusting (quick and dirty testing and they were able to "fix" a case to house an object better than it would have been in storage.) We've also used the datalogger to prove to university powers-that-be that one of our buildings is not adequately heated/cooled by giving them charts from different rooms in the building (not that it'll do any good, but I feel better.) Caveat: the program kept crashing a computer at first and our conservator had to battle it out with the company, but even with that, we have hard data that is EASY to use. We have ten beached hydrothermagraphs rusting into oblivion...I predict that the one sitting in collection storage space will be accessioned by some future CM if I don't move it out. Sally Baulch Collections Manager, Anthropology/History Texas Memorial Museum