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I like the 467 seeing how the results seem to be really good and I don't have to set different settings for each gun like the Sencore CR70.. Beltrons have weaker results when testing compared to a B&K 467 and a Sencore CR70.. I've tested different tubes with three different Beltron units compared to the other testers and the beltrons give approx same weaker results.. I've seen the 490 on Ebay a few times and looks like it functions just like the 467, with a much nicer more well built case and a different color interface.. I've seen a 490B and that looks like it has many more functions that I have no idea what they do..
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