Description H2S-A41 - Hydrogen Sulphide (H2S) Sensor - A-Series - 4-pin PPB Datasheet: https://ametekcdn.azureedge.net/mediafiles/project/oneweb/oneweb/alphasense/products/datasheets/alphasense_h2s-a4_datasheet_mar24_en_1.pdf?revision:8e28934e-c4e3-4c41-8bbc-d44e0e7f509b