This was purchased as part of a larger estate, it appears un-used , but I cannot positively state that. I listed it as used, There are no tool marks on the unit. It does appear new. I do not know much about this Item , but it can be researched on the internet. Please ask any questions before bidding. View all pictures as they are part of the description. The unit is being sold "AS-IS" due to the fact I do not have the ability to test it. It is up to the purchaser to make sure this is the right item for their application. FREE shipping within the continental United States.