This unit came from a US govt. facility, This unit came as one of the peripherals of a MAT 252 Mass Spec from ORNL and stated to be in working condition. Also have a Thermo Finnigan Combustion 3 on another listing. I have another identical unit that will be listed after this one sells. If not satisfied, return in 14 days for full refund, less shipping. We ship a lot of freight and use 3 different freight broker to save the buyer on their shipping cost, and do not profit on shipping, or we will provide weight and dimensions to the buyer if they prefer to handle the shipping. We have a verified commercial address with forklifts and loading docks at zip 37847 General Policies: Please ask any questions before you bid. Do not assume I am an expert in anything I sell. I HAVE A NO RETURN POLICY UNLESS THE ITEM HAS BEEN GROSSLY MISREPRESENTED. Please contact me within 2 days of receiving your item to resolve any problems. The buyer will be responsible for all return shipping costs. Payment is required within 5 days of end of an auction. If you have multiple purchases please contact me and I will combine shipping costs where possible.