I have recently purchased a trimix analyzer and no longer need my nitrox analyzer. I have up for grabs a homebuilt oxyhacker style nitrox analyzer in a polycase electronics housing with battery compartment (so there is no disassembly to change the battery as is the case with other models). I built this a couple years ago and the sensor is still performing very well. It has always been stored with the Oxycheq sensor saver cap in place. It holds calibration well and shows analysis without issues. Also included from Oxycheq their R17D sensor, deluxe DIN flow restrictor, expedition flow cap, and sensor saver cap. These accessories alone sell for $110 and are in like new condition. This will allow stable flow rates across the sensor from any DIN tank or a yoke tank if you add a DIN to yoke adapter. This stable flow rate helps assure an accurate analysis of the gas. Please feel free to ask any questions that you may have. I will attempt to post some pictures here but have not had a lot of success with that in the past. I do have photos available now including a picture of the analyzer in use. Just PM me with your email address and I will send the pictures to you. I am looking for $175 shipped to you in the US but will entertain reasonable offers.