Help testing a 15GP22 from RCA CT-100

[Radioman237]

I need to test a 15GP22. I have a B & K 455 tester. I'm going to make sure the tester works first. Then I suppose I'll have to make an adapter with alligator clips. There is no data on this tube in the chart. There are three settings for for G2. So if anyone is familiar with this tester and can offer any advice or detailed instructions that would be a great help. I have already been told not to attempt any rejuvenation.

Robert Ramirez