Returns - Goods may not be returned for credit except with Seller's permission, and then only in strict compliance with Seller's return shipment instructions. Certain items may not be returned for credit. These items include: diagnostic reagents, refrigerated or frozen products; reagents and standards which have passed their expiration dates; custom products or special orders; products missing labels, parts, or instruction manuals; and books, computer software and equipment removed from their original packaging. Any returned items may be subject to a 20% processing fee.