® = Recommended

Sensor - the type of sensor used in manufacture.  For a detailed explanation, see "Sensor Types" under FAQ

Display Method - from the 5x LED's of the CA1000 that light up to indicate a range (eg. >0.02% <0.05%) to the multi-line, full menu display of the 6510.

Units - how the reading is displayed (like a scale displaying Kilos vs Pounds vs Stones etc). For a list of the UK limits in each category, see the FAQ

Steps to UK Drink Drive - starting at a reading of zero, how many increments the unit displays before indicating the UK drink drive limit. For example, the UK limit in BAC% is 0.08% - so on a 3 digit LED display (eg. CA2000), there will be 8 "steps" between zero (0.00) and the limit (0.08).  The AL5000 & AL6000 Pro models on the other hand display mg/L, where the UK limit is 0.40mg/L, so there would be 40 "steps" from zero (0.00) to the limit (0.40). For more info see our FAQ

Approval Level - in the UK, only Fuel Cell devices are type approved - in the US these are known as EBT's (Evidential Breath Testers). There is also a lower classification in the US (ASD) which certifies that a device is able to DETECT alcohol, but does NOT certify the detectors ability to accurately display a specific reading.  These are good devices for home and personal use, but should not be considered accurate enough for professional or company use - see Employee Testing and FAQ.

Sampling Method - from a simple static sensor which the user blows towards, to the physical relief valve on a professional device that measures an exact volume of air before diverting excess air out of the unit. The consistency of the sample is key to an accurate reading - see "Sampling Methods" under FAQ

Sample Time - to SOME extent, the longer the sample time, the more accurate the sample, although tests with our professional Draeger devices has shown that most people will achieve a full breath sample in around 3-4 seconds. Most of the Premiere models incorporate a pressure sensor of some description to ensure a MINIMUM blow pressure, and the new J4x varies the blow time dependant upon pressure but only the use of a relief valve can ensure an exact volumetric comparison for evidential use.