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free shipping Upgraded version Carbon dioxide sensor module CO2 sensor module MG811 module output voltage 0 2V-in Sensors from Electronic Components & Supplies on Aliexpress.com | Alibaba Group
[https://www.aliexpress.com/item/free-shipping-Carbon-dioxide-sensor-module-CO2-sensor-module-MG811-module-output-voltage-0-2V/1673134567.html?spm=2114.30010308.3.26.Z8hXwz&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_10084_10083_10080_10082_10081] - - public:Hans