VU meter for mic?

If I use the internal mic on my Macbook pro, I see the mic levels on the VU meter. However, when I use an external mic, all I see is that tiny level indicator on the mic section. That isn’t helpful at all. Is there a fix? I also had this problem with my Win machine. (Btw, the internal mic just can’t measure up to an external one.)

So the VU meter is responding for your external Mic?
I guess you simply need to turn up the pregain knob?