Meet the Mindfield eSense Skin Response: a biofeedback training system that doubles as a stress tracker. It performs skin conductance measurement using the microphone of your smartphone or tablet. You can use this kit to track and manage your stress level. The accompanying app allows you to export your data in CSV and PDF format.
The eSense Skin Response lets you do biofeedback training and teaches you how to calm down and sleep better. It comes with a sensor, 2 electrodes, and everything you need to get started.[where to get it]