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I use a B&K 445 for testing monochrome CRTs, it seems to predict a good picture consistently, but I disconnected the rejuvenate (dynamic intensifier) button due to its brute-force method.
Before I got the B&K, I always used my Heathkit IT-5320 to rejuvenate and never had a problem but it is not the most accurate tester.
The Heathkit limits current (and potential damage) using incandescent S-7 120v lamps and has a clean function that is much milder than the Rejuvenate.
For both "restore" functions, you start out with a cold filament and ramp it up slowly until a steady current is drawn. It takes practice, but with a CR70, rejuvenation is much more foolproof, hence the value.
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"When resistors increase in value, they're worthless"
-Dave G
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