A certificate of conformity is not a calibration certification. It’s a certification that claims the equipment conforms on the EN normal it absolutely was made and constructed for. If you don’t have an in day certificate then it’s not calibrated. Regardless of whether that’s crucial to you is another issue. https://glowwire90123.get-blogging.com/35428838/the-smart-trick-of-dust-test-chamber-that-no-one-is-discussing