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Adafruit SCD-30 - NDIR CO2 Temperature and Humidity Sensor [STEMMA QT / Qwiic] : ID 4867 : $58.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Arduino Raspberry Pi Microcontrollers Co2 Sensor Detector Carbon Dioxide Module Uart Infrared 0-50000ppm Genuino 101 - Gas Detector - AliExpress