With infrared absorption spectroscopy, CM2200 Infrared End-Tidal Carbon Dioxide Module can measure the CO2 concentration at the end of an exhaled breath. Its compatible with Respironics CapnoStat5 or CPT Protocols, and widely used for Anesthetic machine, Respirator, Et CO2 Monitor etc. Principle of Operation? Non-dispersive infrared (NDIR) Measuring range CO2 0 to 20%vol Resolution 0.1 mmHg @ 0 to 49 mmHg 0.2 mmHg @ 50 to 150 mmHg CO2 Accuracy ±2 mmHg @ <5.0% CO2 (at BTPS) 41-70mmHg ± 5% of reading 71-100mmHg ± 8% of reading 101-150mmHg ±10% of reading Response Time Detector: 28ms System: 200ms Size 50mm×23mm×36mm Extend applications : Pulmonary Gas Exchange testing OEM SERVICE IS AVAILABLE .