PE DMA7 S/N: 539N8021703 PART No.: N5390051 PE TAC7 S/N: 519N8022002 PART No.: N5190071 This used Perkin Elmer DMA7 with PE TAC 7dx controller will be sold as it is. No warranty is provided. It is not always available. Please make a reasonable offer -- you may get it. Thanks for looking and we look forward to hearing from you!