Up for sale is one used, un tested, out of cal, sold in working order featuring a JGR Optics Multi Output 50/125 um, FC-APC Remote head back reflection meter detector cal module I believe.  Not exactly sure what this is.  I believe it is a calibration Module.   See photos for details and add 29.99 for shipping fedex ground within the continental USA not including Alaska, Canada, Mexico, HI, PR or any out of country shipments.  Extra charges will apply