As an archivist, I get to use lots of fun tools: bone folders, microspatulas, um.... pencils? But the most fun of all is my brand new toy, the sling psychrometer!
First of all, the name "sling psychrometer" is immensely fun to say. Almost as fun as hygrothermograph.
Secondly, it is helpful in that it tells me the actual relative humidity in a room, allowing me to mentally calibrate my digital (and uncalibratable) temperature/humidity monitors and then be sad because the humidity is always too high in my storage area and there isn't anything I can do about it.
And thirdly, and most importantly, when using the sling psychrometer, you actually whirl it around in a very satisfying way. Just take a look at this video and watch some sports dude show you how to use this tool.