How accurate are 'over the counter' breathalyser testers?

Question

How accurate are 'over the counter' breathalyser testers?

Answer 1

you wont need one if you dont drink then drive. and if you know u have to drive somewhere the next day have soft drinks. boring but better than a ban or killing someone

Answer 2

very

Answer 3

The new one that we use at work costs a grand each, why would we pay that if we could get one for a fiver?

They are simply an indication and do not give an accurate measure of the alcohol that's in your system.

Most of them have small print on them saying such.

As previously stated in other answers, don't drink and drive, cos if you do you could end up in the back of my car and then in a cell.

Answer 4

Reasonably good.    But why bother?   Just do not drink and drive at all.

Answer 5

Are you talking about alcohol sensors?