Here are all 3 testers, Heathkit IT5320 is set to compare cutoff of blue/red lower, with green highest at 10. Some allowance is made for this when the screen and drive controls are set-up.
HK cutoff - all3.jpg
Two B&K model 467, each needs some work but there are many adapters also. Too bad those ABS plastic cases dont hold up.
BK 467s.jpg
Heathkit IT5320 cutoff control is set to peg meters on good emission, the "cleaning" function is similar to the Beltron and is usually sufficient to wake up a tired CRT
HK full on.jpg
B&K 445 has a switch for RGB, here its showing red's emission. The "dyn" lo-med-hi is discharge type rejuvenation, as risky as the Beltron's (socket 3) according to several accounts.
BK445 full on.jpg
The Beltron 2972D is a great tester. The cleaning (socket 2) effective, but don't use as much filament voltage (10) as the directions read, plus you know its complete when the lights all come on.
Beltron 2972D.jpg