Ordered from Divegearexpress by mistake instead of PSR-11-39 MD5 for my OMS oxygen analyzer only to find out that it does not match with factory adjustment resistor on my analyzer. It is out of the bag now but I sealed it with o-ring and original plug after 10 min test on a bench. It is good before OCT-23-2022. I would sell it for $50 shipping to lower 48 included.