Pidgin: Font Size

How do I know what font size is being sent out to the person on the recieving end?

I installed the latest version of Gaim portable and I see the increase/decrease font size button, But people on the other end say the font is huge but looks ok on my screen.

I hit the lower font size and they say it looks ok, then I can hardly see it on my screen because it has gotten so small.

Is their a work around or setting to make the out going font size a certain size that doesn't change?