This is used, but only used 1-2 times 7500 Real Time PCR Systems Spectral Calibration Kit, includes Catalog number 4349180 and 4351151, guarantee can pass calibration test
To do calibration need use two kits 4349180 and 4351151 together
the new kits cost around $1700, our used about half price
More info at [link removed by eBay] and [link removed by eBay]
we also have Brand New Calibration Kit available http://www.ebay.com/itm/143266419974