Personal Breath Testers
These are designed and perfectly suited for carrying around in your pocket or handbag for discreet sampling of your breath/alcohol intoxication level. These personal breath testers also work well as independent judges, should you need to check whether a child or adult member of the family has been drinking alcohol.
They will give a reading which is generally between 0.2% BAC and about 1.0% BAC, depending on the unit, at which point a high reading will be indicated. For reference purposes the UK drink drive level is 0.8% BAC.