We have a Fluke ProSim4 Vital Signs Simulator that we use for such devices but generally we know how to get in to the engineering / verification mode.

Where a user has managed to purchase a device we cannot find information on we use the simulator and keep records on that particular monitor and refer back to them.

Depending on the algotithm the manufacturer uses you should get consistent results using a simulator such as the Fluke.

Solihull Hospital
University Hospitals Birmingham