We don't calibrate or certify anything; All equipment is sold in working condition (unless otherwise clearly specified as parts/not working) but should be considered "as is" and with no warranties expresses or implied. 

DISCLAIMER: Regardless of the origin of the equipment, documentation provided or identification appearing upon the equipment, the equipment described and offered here is in no way certified for, recommended for, or offered for any specific use. The purchaser agrees that the seller shall not be held responsible or liable for any injuries or damages, whether incidental or consequential, associated in any way with the equipment. The purchaser, by bidding on this equipment, indicates their acknowledgement of, and agreement to the terms of this disclaimer.