Tube test numbers - what exactly do they mean

Ring Tube Depot and ask them?

Just about every tube tester uses a different scale. If you knew what tester they used someone might be able to tell you, but I think you’re going to have to call them to find out what tester they used, what is average new on that tester for your tube (maybe the 200) and what is minimum good (usually 65% of average new).

Call Tube Depot they are very accommodating and they are one of few Dealers who have a proper 845/211 tube test that applies over 1,000+ volts to the plates.

So Tube Depot answered me and said that 70 is the plate current and 200 is the transconductance.  They said that this means that the tubes have 70% of their lifespan left.  Those 845s really last, don't they?
I don't listen all that much, but those things run hot as hell.  You wouldn't think they'd go so many years.  

Is transconductance the only thing Tube Depot tests for? Head over to the RAM Labs site, and see all the data they supply with their tubes.

I know there are other tests that can be run and I think they were trying to simplify things for me.  I originally wanted Andy at Vintage Tube Services to test them, but he never got back to me.  I'm not going to take this any further.  The tubes tested good and they sound good and that's enough for me.  Tubes are like analog - you can spend your life agonizing over whether every parameter is perfect or you can get it in the ballpark and just enjoy.  IMO, if you're going to sit around wondering whether the 45 possible measurements are all perfect, you should go with solid state because even if they're perfect today, they may not be tomorrow.