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COTK-57 Digital Carbon Dioxide (CO2) Temperature Humidity Meter 9999ppm NDIR Sensor IAQ Tester - Tekcoplus Ltd.
EXTECH, Backlit LCD, 0 to 9,999 ppm CO2 Concentration, Indoor Air Quality Carbon Dioxide Meter - 30ZV04|CO240 - Grainger
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Amazon.com: Pyle Meters Hand Held Carbon Monoxide Meter - High Accuracy and 1000 PPM Measurement Range CO Sensor w/Digital LCD Display Auto Power Off Battery Operated and Control Buttons - Pyle PCMM05 :
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Lunarlipes Handheld Carbon Monoxide Meter, Portable CO Carbon Monoxide Detector, CO Gas Tester with LCD Backlit Display, 0-1000PPM High Precision 1PPM Resolution (Battery Not Included) AS8700A - - Amazon.com
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