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Infrared Carbon Dioxide CO2 C4 sensor in 4 or 7 series standard size with integrated analogue (standard 0.4-2.0V) transmitter, 0-5000ppm, 0-2% vol.; 0-5% vol.; 0-100% vol
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Z19C IR Infrared CO2 Sensor Module Carbon Dioxide Sensor NDIR for CO2 Monitor 400-5000Ppm UART PWM Output - Walmart.com