Hi Jol. May I ask what is your overall goal here?
If it is to do some home recording and measurement, then an Interface is needed.
If you want to Measure only, I recommend borrowing a preamp and using your existing soundcard. Perhaps an even better option ongoing would be to buy a Measurement Mic with USB on board. The MiniDSP UMK-1 one comes with an individual Calibration File.
If you intend getting into sophisticated measurement you will need an interface with a second channel for Loopback Correction.
I kinda like the look of the Mackie Blackjack.
If you are getting into Measurement with possible DRC, there are products which involve the Mic and Room Correction software, e.g. ARC

DD