I saw this tool which claims to help you to relieve stress this is what it says.

insert my finger into the trap door on the top left and begin working to control my breathing pattern. If you haven’t used it in a while, it coaxes you to reset date and time. Then it begins with a straight line…. and you begin to breath. What the manual recommends is that you breath in through the nose and then exhale from your mouth. What’s different from some other meditation and yoga methods is the StressEraser doesn’t want you to count on the inhale, but just to breathe in as deeply as you can. On the exhale you should do it slowly with a count to three, four, or five. The idea is to create a curving graph of regularity that can be worth 1 or 3 points on the device.

This device cost you 250 bucks. But the point is that the machine actually doesn’t relieve stress. It only measures the amount of stress you have. The actual stress relief part , well ,you have to do it your self. Its funny to see people fall for this kind of marketing tricks. The name should have been StressMessurer , then who would buy it for 250$.