The only machine that will work as in hooked up to the ResMed machine is the Nonin ( forget exactly which model) and it's really expensive.
Most of the people who want to monitor their Oxygen levels will go the much less costly route with one of the CMS overnight pulse ox.https://www.cpapman.com/oxygen-system-s ... -1442.html
nearly $1K for the Nonin vs beteen $50 and $100 for one of the CMS models depending on features you want.
Which Contec model do you have?
Is it a spot check or does it record overnight and have software available?
SleepyHead is currently compatible with Contec CMS50D+, CMS50E, CMS50F and CMS50I serial oximeters.
(Note: Direct importing from bluetooth models is probaby not possible yet)