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That isn't a service type tester, but a power supply used in CRT production testing. It would be used in conjunction with a deflection system to actually light up the screen and operate the entire tube under real world conditions.
With only one exception that I know of, the service shop type testers only run the gun portion of the tube, with no high voltage on the anode, and consequently no light on the screen.
You COULD use that Bertan unit to test a CRT, but you would need to have the yoke installed and operating, and get the typical operating voltages from the tube datasheet. And then you wont get a good/bad result, just visual observations of brightness/focus, and voltage readings to compare against published curves from the datasheet. Not a practical device for the repair shop, except maybe as a substitute HV supply for testing?
Look around for a real service type CRT tester. They go cheaply now that nobody wants CRT sets repaired anymore...
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