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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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SCD30 CO2 sensor module Sensirion | Sensirion SCD30 Series Temperature & Humidity Sensor, PWM Output, Surface Mount, I2C, UART, ±0.5%, 7 Pins | 172-0552 | RS Components
For Sensirion SCD30 CO2 Sensor Carbon Dioxide Sensor For Air Quality Monitoring | eBay