see for (oneself)

To see or experience something firsthand as a means of proving to oneself that it is true or accurate. A: "Restarting the computer didn't fix the issue?" B: "See for yourself! It just keeps getting stuck." I couldn't believe that his car could actually park automatically, so I had to go over and see for myself.

ˌsee for yourˈself

see or experience something yourself so that you will believe it is true: Don’t you believe she’s here? Well, come in and see for yourself.