Buying your own breathalyser, what's the most reliable model to buy?

Convicted Driver Insurance

Routemaster

Member
I'm thinking of buying my own breathalyser just so I can be sure its safe to drive for example the morning after , but there are a lot of devices ranging from less than £10 to £500+.
I've checked the reviews on Amazon and they don't seem to help.

I'm sure the accuracy of the cheap models is questionable.

Can anyone recommend an accurate reliable breathalyser which isn't too expensive?
 
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