More of a novelty or general test than anything else
If you're looking for something to test with absolute accuracy, then this probably isn't for you. Then again, if you're looking to make sure that someone is just under the legal limit they likely shouldn't be driving in the first place.<br /><br />It's easy enough to use and easy to interpret the results, two things that are absolutely in its favor. To be honest, I got this more to bring out at parties as a discussion piece. If it also helps ensure that people drive sober, then that's good as well.<br /><br />I agree with another user that this would be good to use as a way to caution someone if they are getting too close to the legal limit and as such, to stop drinking at that point in time. It's easy to let that sneak up on you, so it would be excellent in that regard.
Rating: 4 stars