The spit stress detector

When you're stressed out you probably really don't need anything to measure just how stressed out you really are, but just in case you like to keep track of these sorts of metrics, Yamaha's coming out with a little gadget which can gauge your stress level by reading how much amylase is in your saliva
(we don't know how exactly that works, but we're not going to stress out about it). Besides, the stress detector is mainly meant for use by researchers, anyway.