CO click - mikroBUS board with MQ-7 sensor for Carbon monoxide sensing
Prana Air CO Sensor: 500 PPM | Electrochemical - High Accuracy
First Alert SC7010B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup - Walmart.com
Smoke and Carbon Monoxide Detector Battery Powered Dual Sensor Combination Smoke & CO Alarm with LCD Screen, Led Indicator and Loud Sound Alert, Complies with UL 217 & UL 2034 Standards - - Amazon.com
Carbon Monoxide Sensor
Carbon Monoxide Gas Detector (CO) Monitor Industrial Safety ppm sensor
Gas and CO Sensor Calibration for Auto Ventilation Systems - Eurotec
Lunarlipes Handheld Carbon Monoxide Meter, Portable Carbon Monoxide Detector, Professional-Grade CO Sensor Tester with LCD Backlit Display, 0-1000PPM Range for Industrial & Home (Battery Not Included) - - Amazon.com
110-102 SPEC Sensors (a division of Interlink Electronics) | Sensors, Transducers | DigiKey
CO Room | Automation Components, Inc.
Dual Gas CO and CH4 Detection Sensor - MQ-9B - SEN-17050 - SparkFun Electronics
Carbon Monoxide (CO) Gas Detector | Ventilation Control Products Sweden AB
Carbon monoxide detector - CO Sensor | FIBARO
Adafruit MiCS5524 CO, Alcohol and VOC Gas Sensor Breakout : ID 3199 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Prana Air CO Sensor 500 PPM | Electrochemical - Highly Accurate