After my first breathalyzer which I bought 1.5 years ago was unfortunately lost, I have on here Amazon times all current models (and their customers opinions) considered in more detail. Stuck I am with this model. The device comes with a beautiful black suitcase by all parts (instrument, mouthpieces, cable, etc.) . are First measurements seem to me plausible (at least to my previous unit). The DA-9000 has a nice size us looks very valuable. The menu can be set in many cases (for more details, but I've yet not been tested). Very nice (and very interesting) is the reading of the device with the PC software. Since the Tester has a memory with 250 measurement results can thus be a nice history (should I think that be mainly for companies and authorities!). I have also read that it gives to a printer optional! I can recommend the Alcofind DA-9000 definitely very!