Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
Really easy to use also if mine was only with chinese instructions. Nice little led flashlight. It seems to be very accurate.
The screen is not visible in the dark and you need 1.5 alkaline batteries at the maximum charge to have a good vision of the little numbers on the screen; anyway this is not really a cons, only and advice.
I tried to test it by a software on the net and it seems to be very accurate; obviously it cannot be an official product to test your alcohol level in your blood, and the only way to be safe is to DO NOT drink before driving or working in not safe places where you need maximum level of attention.
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