The Sencore CR-70 is less likely in my experience to write off a usable tube. My favorite CRT tester is the Beltron (I've modified mine a bit though), my second is the Sencore CR-70.
A few years back, someone at the ETF one year tested a 16AP4 in the auction with their Sencore CR-70. They declared the tube dead. I went ahead, tested it on my Beltron, and it looked fine to me. I won it on the silent auction for $5 or $10 or something ridiculous. Took it home, popped it in a working Westinghouse set, and it was a perfectly good, strong tube. I think I flipped it for $70...
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