Working,very nice, clean 100 kc calibrator for sale, $50.00 plus USPS flat rate box shipping. Found a XCU-303 so this one is no longer needed Pix and details on request to serious buyers. . . . Gene, WØQFC Stuff for sale: www.w0qfc.shutterfly.com Web site: www.w0qfc.com AF&AM #91 Lafayette CO