[NJARC] Testing tubes?

[StephenTetorka at cs.com]

I'm sure this must be the 1,995,986th question on this subject.

1.  How can I check my vintage radio tubes other than replacement and tapping 
into the wires to measure current in-situ?

2.  Might there be a suitable tube tester for the vintage radio tubes?

3.  Might there be a preferred wiring arrangement suitable of testing outside 
or radio?

Any/all recommendations welcome,
Steve