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You should spend the same type of effort testing and restoring the CRT testers as you would a TV. Vintage electronics is vintage electronics, the TV and testers are made of similar stuff.
Check the manuals for possible checks of the testers. You could also look at the schematics and come up it some ways of confirming operations. Most CRT testers have fairly simple circuits. Basically testing a CRT like a triode.
You could also connect the 21" CRT to a working TV to double check the operation.
Try the testers, but not the "clear short" function, on a known good CRT.
" The fault, dear Brutus, is not in our stars, but in ourselves, that we are underlings. "
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