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Leybold UL100 Plus Helium Mass Spectrometer Leak Detector Portable Turbo Pump. Unit shows some cosmetic wear, please see pictures. However it has very low hours, service menu at the time of listing the item shows less then 3900 hours (it maybe slightly higher at the time of sale). No liquid nitrogen needed for operation. Condition is For parts or not working. Unit powers up but no further testing performed. Please feel free to ask any questions you may have. Thank you for your interest. Please check out my other listings, I am happy to combine shipping to save you some money. Shipped with UPS ground, item is very heavy. Local pick up always welcome and free of charge.Thank you for your interest!