Available For PurchaseScreek Storehttps://store.screek.io/products/sco2-1‣eBay Store: https://www.ebay.com/itm/186344759846‣For Singapore, China, Hong Kong, Taiwan and Vietnam, the alternate choice is Taobao:NewsNameTags🧛[SCO2-1][Tips]Some custom cards that can be used for CO2 displayCards🦕SCO2-1 No-ASC(automatic calibration) Version Firmware🎇SCO2-1 Shell Deviation Optimization🪄Daily CO₂ Observations🪄SCO2-1 Automatic Calibration, Manual Forced Calibration GuideGuide🪄SCO2-1 Sensor Source Code🪄SCO2-1 Temperature and Humidity Properties of Carbon Dioxide Sensors Explained🪄[FAQ]It is safe to put sensor surface outside cover? It is not fragile and sensitive?FAQ🪄CO2 Sensor SCO2-1 ReleasedNewsFirmwareBeta FirmwareSCO2-1 Beta FirmwareHelp⛏️Fix firmware update failures