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I've found the cutoff indication on a Sencore CR-70 to be unreliable at best, and I don't like having to test the three guns of a color CRT in turn.
My personal favorite CRT testers are the various Beltron models. They're all essentially the same; they use an auto-bias circuit, so all you have to set is the filament voltage and wait to see what kind of current you can draw from the cathode(s). In general, if you can pull 0.75 μA from the cathode, the tube will produce some sort of picture.
I modified mine one step further and wired a Sola filament transformer into it. It kicks out a constant 6.3 volts to +/- 3%, up to 5 amps. I just plug the tester in, plug the tube into it, and wait.
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