Tube tester?

Numbers are specific to each tube tester so to know what they mean you have to know what tube tester it was tested on and look up in the manual what the new and minumum numbers are.

Exactly. 

@elliottbnewcombjr

Good point to get a tube tester, when:

.you have a lot of tubes, meaning selling, buying or your equipment uses many and requires frequent tube change. Yes in the long run it would be more economical too.

.have learnt a lot about your tubes or tubes in general and know what you want to measure.

.can maintain your tube tester, especially when vintage

.if you want to buy a tube tester, whether vintage or new, do not get a cheap one, a different research is needed for what kind of tube tester you need.

Otherwise a good and reputable vendor can mostly provide what is requested and with valid measurements.