Check the listing for details. Anritsu Source/LO1 Module - 61917 Board ZF-63520603 Vector Analyzer Options. Condition: For parts or not working. Listed at 249.00 USD. Anritsu/L01 source module that I believe is for a vector network analyzer. This particular unit was owned by an Anritsu/Wiltron systems design engineer. There were no notes on this unit to indicated whether it was used in a machine or if it operates. The numbers on the board and the year (2005) indicate this board is for a newer machine. I am unable to test this item and I don't really know much about this technology. Therefore, it is sold as-is, as pictured. For the price, it's well worth the parts. This unit itself sells in the thousands, used. -- This was owned by a former design/systems engineer for Anrtisu out of Morgan Hill, CA. He had many components, prototypes, and complete machines. If the component was bad, he typically marked it as such. I will not be listing items specifically marked as bad. I don't have the knowledge or capability to test, so all of the items are sold as-is. I have many misc supplies and equipment. If you want something specific, let me know.