A color calibrator was perhaps the best non-photographic photographic purchase I've ever made. If you're not calibrating your displays, this helpful video will show you exactly why you should reconsider that.
Coming to you from Aaron Nace of Phlearn, this video examines the topic of color calibration and why this is an especially important issue for photographers. If you're sending files to clients, posting your shots online, or making prints, having your monitors calibrated for both color and brightness can save you quite a bit of headache down the road. Although Nace mostly talks about consistency between his multiple displays, even if you only own one, you still should want that display to be accurate for when you have to send your files elsewhere. What makes a calibrator so helpful is that it sets your monitor in response to the ambient light in your environment; so, if your lighting is a little yellow or a bright compared to average, your monitor will be adjusted to compensate. I personally use (and Nace recommends) the Datacolor Spyder system, recalibrating my display every few weeks. It only take a few minutes (I just make some tea while I wait), and it keeps everything consistent. If you'd like to learn more about them (and see their awesome promotion that ends this month), check out our recent article.