What is the UK drink driving legal limt currently ?
Blood Alcohol Concentrations (BAC) – 80 milligrammes of alcohol in 100 millilitres, 80mg/ml, 080 on mg/100ml display or 0.08 %BAC, 0.8 Promille
Breath Alcohol Concentrations (BrAC) – 35 microgrammes of alcohol per 100 millilitres of breath BrAC
What is the best buy for home breathalyser use ?
Higher price does not always mean higher accuracy, as the expensive breathalyser models are designed to be serviced regularly to maintain their accuracy and dont have on board self diagnostics.
Here are some key points to consider when buying a DIY digital breathalyser:
1) Insist on interchangeable sensors – without this you are tied to sending the breathalyser regularly to a service centre for calibration services.
2) The breathalyser must have selectivity of no less than +/-0.01% BAC which is the same as +/- 10mg/100ml BAC. (avoid units with +/-0.02% and over)
3) Choose your display scale and stick to it, most digital breathalysers either display as %BAC or mg/100ml BAC (BAC=Blood Alcohol Concentration) dont confuse this with BrAC .(Breath Alcohol Concentration) which is available but rarer.
4) Be realistic, under £25 and you are getting a novelty device which you should not rely upon. Expect to pay £35-£70 for a digital breathalyser which will work well, give reliable readings, cost £15-20 to replace the sensor (every 300 tests or 6 monthly)
Can I rely on the results when choosing to drive ?
No. Breathalysers should not be used to test your ability to drive legally, as a breathalyser will measure only your current blood alcohol levels. These can rise after testing if the unit is being used immeditaely after drinking. Breathalysers should be used the morning after to confirm that alcohol has left the body.