Check the listing for details. HP 85091-60004 Electronic Calibration Module 300 khz - 9 GHz. Condition: Seller refurbished. Listed at 495.00 USD. HP 85091-60004Calibration Module 300 khz - 9 GHz we received this module from keysight14 day Right Of Return IMPORTANT! Due to PayPal's new rule that requires sellers to absorb the 3% fee on any returns. We will need to charge a 3 % restocking fee for any and all returns / refunds. NEW POLICY READ!!! Buyer to pay shipping for both ways for all returns.We will repair all parts and labor for no out of pocket cost to you except the shipping .For any refunds there is a 3 % restocking fee unless the item is exchanged which is easier for us often since we have multiples of these in stock usually . Buyer will also accrue another 3% paypal fee having the money returned by using paypal if paid via paypal originally. (this new rule is because of paypal’s new greedy way of not returning the original fee back on returns/refunds and I regrettably have to bring this new policy to you the buyers.)The point is you will save a lot more money doing an exchange over doing a return