Here I found several razor corresponding to these requirements. So I tested the vacuum shaver (BT 7090) Philips QT4023 and this here.
Of course the vacuum razor had only an adjustment to 1 mm was, however, first a little excited about this. This vacuum system creates only a good 3/4 of stubble absorb. Furthermore, the vacuum had only a stainless steel blade; what is totally OK, but compared to the other "cheaper" products a disadvantage.
The Philips QT 4023 felt in your hand much more difficult as the QT 4015 (very slightly) and the hair was cut very well. No chirp no tweak, really awesome. Only shortcoming. I can imagine that in different holding positions of the beard is shaved in different lengths.
The Philips QT 4015 felt after shaving also very well received. For me, he shaved all gone very thoroughly. Drawback for me was that this one was very very easy.
Nevertheless, it has become the beard trimmer. How So?
The advantage between this beard trimmer and the QT 4023 is the one that I had that feeling of getting to the QT 4015 an unclean result during shaving. As a further point, I saw the "Trimmer part", which completely surrounds the shaving head. A nice gimmick: my hairs caught in it here and I can throw away collected the stubble. This effect is almost as good as the vacuum system.
Best Buy for all who want to have a good cost-effective 3-day beard shavers and can do without high-quality design and gadgets like vacuum or laser stuff.