1. Alcohol Tester 2.Weight only 15-20g/pc 3 ... Alcohol Tester for iPhone, iPod, iPadFeature: 1. Adopting new gas detection technology , which can detecting the more actual alcohol content of gas 2. LCD ... identify cigarettes, coke,coffe smells and prevent non alcohol gas to interfere the detecting result. 4. It ... then press switch of tester for 2-3 seconds, at the same time LCD screen will appear mactching ...