After a lot of clinical experiments, National Medical improved the C200 Internal ETCO2 module constantly. And CO2 range is raised to 20% from 13%, respiratory rate to 150BPM, CO2 accuracy within 5%. In all circumstances, the real-time CO2 reading, respiratory rate, CO2 concentration, and ETCO2 value always keep in excellent accuracy. With a sampling rate of 50~250 ml/min, it can meet the users' requirement of Low flow/ Micro flow. And it uses long-life IR source (100 thousand hours life) for longer life