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I've got an EC.4, it's a fantastic little unit. Mine is on virtually 24/7, probably for about 300 days a year. Had it for about 2 years now with not a single whinge, it just goes and goes and goes. I change the oil roughly every 500 hours, other than that it just gets hammered.
And yes, very high vacuum. My GDH-200 digital vac gauge indicates less than 1mbar on a fully sealed chamber.
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