looking for easy tester for kt-88, 12ax7, 12au7

Is there a good tube tester that I need to look for that will test most of the crucial things on these tubes? I am looking for something good and cheap. I am not ready for anything top shelf.

I am starting to gather up a few tubes and figure I better start learning a little bit about them.

Is there a Vaccuum Tubes for Dummies Book out there?