The app measures how light is absorbed by oxygenated vs. deoxygenated hemoglobin, then calculates an estimated SpO2 percentage. A normal reading ranges from ; anything consistently below 92% warrants medical attention.

SpO2 Assistant 31 is a specialized software application designed to interface with pulse oximeters, particularly those manufactured by Contec Medical Systems. The "3.1" version is often sought after for its stability and compatibility with a wide range of CMS-series devices, such as the popular CMS50D+, CMS50E, and CMS50F.

SpO2 Assistant 3.1 is a free Windows-based application designed to monitor and analyze data from pulse oximeters , particularly those manufactured by Contec Medical Systems , such as the

The term typically refers to a version number (e.g., Version 3.1 or a build number 31). A free version of this tool is highly coveted because many proprietary oximeter brands charge for their premium data management suites.