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PROOF
Pretty cheap and you might find this useful as a rough gauge(not suggesting you use this as a legal defense).
If you have ever wondered what effect an alcoholic drink has on your Blood Alcohol Level (BAC), now you can check for yourself. The tottering drunkard assuredly slurring that they can handle their drink is something that we have all been and seen. Show them just how much of a trashbag they are or monitor your own trashbaggery with this convenient BAC-checking keyring!
Simply breathe into the breathalysers and within seconds your blood alcohol content will be displayed on the LCD screen. Compact in size, this alcohol breath tester will fit in your pocket so you will have no excuse to leave it behind.
Features
Digital alcohol breath tester
Dual digital display
LCD Screen with backlight
Easy to use
One button operation
Quick results
Auto power off
10 Second warm-up time
Low battery indicator
Clock and alarm function
Power: 2 x AAA batteries (not included)
Colour: Black and white
Weight: 36g
Alcohol Breathalyser Dimensions: (W) 3.5cm x (D) 2cm x (H) 12cm
I wouldn't recommend buying one of these, even for a few bucks. I had one and tried it after various amounts of drinks and the reading are no less random than a number generator.