The personal gas detection devices Pac 6000 and 6500 measure a specific gas quickly and accurately. User-friendliness is ensured by a speech-free display, clear color coding, and a robust, easy-to-grip housing. They feature a triple alarm: acoustic, visual, and vibrating. The sensor response times are fast even under harsh conditions. Measurement and direct display are provided for one of the following gases: CO (carbon monoxide), H2S (hydrogen sulfide), SO2 (sulfur dioxide), or O2 (oxygen). The devices have a time limitation of two years from the first activation.