Here is a device that turns your Samsung Galaxy S4/S3 device into an alcohol tester. It has a digital display that shows you your alcohol level. Its detector can identify cigarettes, coke, and coffee smells and prevent non-alcohol gas to interfere with the detected results. All you have to do is breath into its airhole, and this little gadget takes care of the rest. You don’t even need to install a software to use this. This Backlight Alcohol Tester can be yours for $25.