I have a NUVAIR Oxygen and Trimix analyzer for sale. It was bought in 2009 and I never ended up doing the Trimix diving I intended. The unit has been used for Oxygen analysis only. The Oxygen sensor still works reliably but I will also provide a new sealed in the bag Oxygen sensor to the buyer. Unit can be run on battery power or utilizing the AC adapter with power plug adapters. $650 firm and buyer pays shipping and paypal fee's. Pictures available on request send questions to jacksatlanta@gmail.com.