Brainwave reading headsets have been around for a long time. They haven’t always been affordable though. The NeuroSky MindWave Mobile 2 is a cool kit that helps you learn about your brainwaves, meditate better, and even develop your own apps.
Thanks to this headset, you can see how your brainwaves change in real-time and monitor your level of attention. A bunch of brain training games and educational apps are also available. This EEG headset is available for under $100 at this time.