Not worth getting a tube tester for the purpose you describe unless you have a lot of time, money and patience or are just bored. I have one, but I’m a nerd.
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.
Whoever you bought the tubes from should be able to explain the numbers to you.
Jerry