FOR SALE IS A USED MILITARY SURPLUS MICROLAB FXR FREQUENCY METER.THE MODEL NUMBER IS N410A. THE METER IS MILITARY SURPLUS AND HAS NOT BEEN TESTED. I HAVE NO IDEA IF IT WORKS OR NOT WHEN HOOKED UP. THE BLACK DIAL ON THE BOTTOM TURNS AND THE NUMBERS MOVE AS THEY SHOULD.THE NSN NUMBER IS 6625-00-887-1933. IF YOU HAVE ANY QUESTIONS, PLEASE FEEL FREE TO CALL ME . You will not be disappointed. My feedback speaks for itself. If you have any questions please email me and check out the other items I have for sale. If you have problems with your order, PLEASE CONTACT ME BEFORE LEAVING FEEDBACK. Thanks, Mark