The Serinus 55 Model is a hydrogen sulfide analyzer developed by Ecotech. It is mainly used for constant measurement of H2S in ambient air utilizing an innerl H2S converter. This device is also built based on Serinus 50. In addition, this unit is supplied with U.S. EPA (EQSA0809188), EN (Sira MC 100166/03), and Australian Standard (AS 3580.4.1-2008) approvals.