Readings after some tests completely unusable.

Only the device worked quite well and also indicated values ​​that almost matched the calculated out from BAC Calculator value.

After a few weekends, the measurement results were completely useless. After completely drunken New Year's Eve I even 0.0 per thousand was displayed.

Customer service is also completely useless. If you want to have an answer you have to write more emails until someone takes pity respond one. Now I was able to send the device, got on my first demand, 7 days after the unit has been received, according to DHL by the manufacturer, the answer is that the device would now arrived. In a further demand on my part another 7 days later, I got the answer that you've tested the unit with 0.5 per thousand, it was 0.64 and thus fully displayed was okay.

What a poor performance. Now I'm waiting for the tester to get back to dispose of this electrical waste immediately.

Since you buy a Alkholtester to the alcohol level to celebrate zukönnen assess and gets a bit of plastic with a funny flashing display and nice beep tones.