ACE CLASS	Technical    Tolerance	testing method / device	Application / User / comments
Class 0 Proven devices	+/- 3 %	Evidential testing – Use of 2 test systems: Infra red & electro chemical sensor. Dräger Alcotest 7110   Dräger Alcotest 9510	Large devices, mostly used as a ambulatory device. (Police posts and clinics.) - Approved in court of law since 2001 for blood sample purposes.
Class 1 Classic professional pre-testing devices	+/- 5 %	Electro chemical Sensor – These Breathalysers have a additional passive testing. respectively in the case of medical versions. ACE Y-Series   Dräger Alcotest 6510   Dräger Alcotest 6810 Dräger Alcotest 7410 Plus and Plus RS Envitec Alcoquant 6020   LION Alcometer	Police, addiction clinics, clinics, Industry, Industrial undertakings use these devices for pre-testing. Very reliable results. As hand device, the most precise testing facility. Many Industries swear by this particular device class.
Class 2 Semi professional use	± 8 – 10 %	Semi conductor oder fuel cell measuring technique with exhale time allowance + (hygienic) mouth piece. Able to Calibrate. ACE X-Series Basic ACE X-Series Premium ACE AL6000 Professional + Printer	Social services, Industry, businesses, clubs and private use. Individual tests.
Class 3 Outside aid and self testing	± 10 – 15 %	Semi conductor measuring technique. Sampling with mouth piece; digital display. Able to calibrate. ACE 3000 all versions ACE AL6000 Professional + ACE AL7000	For private use.
Class 4 Party gag	± 15 – 25 %	Semi conductor or chemical disposable test; sampling with mouth piece. Not Calibration compatable according to police rules. ACE AL2500   ACE Quicktest	For entertainment and parties, when fun is of the utmost importance and results are not that crucial. See also Alkomaten im Kuriertest and Alkomaten im WDR-Test .