Difference between Mustang Dyno and Dynojet?

A tuner in the city FINALLY has bought a dyno. There wasn't one before for over 500 miles!

I am heading to the Dyno next week. This will be my first time. I have heard things about the Mustang Dyno. Can't remember if it would give lower results, or higher.

Can someone give me some Dyno 101 notes? I would like to understand more about the Mustang Dyno (that is what I will be using) and this "baseline" you guys are referring to.

I did a search for it and nothing came up /images/graemlins/sad

thanks