Sencore CR31A or B&K 470?

I have an opportunity on a couple of CRT testers and thought I'd get some input...For $45 I can get either a Sencore CR31A or a B&K 470. Both are in really good physical shape, the CR31A a little more so. Both are un-tested, but each has a maunaul. The CR31A has a red probe with it too, which I think is for high voltage.

I know a CR70 is the best, but I don't want to invest that much money right now. I basically want to be able to test CRTs, and maybe try to rejuv one if all else seems hopless.

Are these worth it and is one better than the other?