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This powers up and appears to respond appropriately to inputs. I note calibration services offer to test and adjust this sort of device. I have no idea when or if this has ever been done on this particular piece or if it is now required. It was last in use at a government owned bio-med testing facility
If you find the item is not as described in the ad it may be returned for a purchase price refund. Generally, all of our items have an inspection warranty which kicks in upon delivery for a period of 7 to 14 days. It is not an operational warranty as most items sold on DOTmed require biomedical certification before use. If you require additional coverage please contact us prior to purchase.