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Electrochemical sensing technology - CO alarm detects the presence of carbon monoxide gas, 85 decibel alarm ; Protects during a power failure - CO detector operates on 3-AA batteries ; Easy to read digital display - allows for easy viewing of carbon monoxide levels ; UL Certified, 10-year limited warranty See more product details Hazardous CO2 ppm levels can be shown as the following: normal outdoor level: 350 - 450 ppm; acceptable levels: < 600 ppm; complaints of lack of focus or stuffiness: 600 - 1000 ppm SP700 Carbon Monoxide Meter; SP1000 IAQ NDIR CO2 Meter; 608BT Single Input Manometer with Bluetooth Communication; USA Handheld Test & Measurement Equipment What's New Featured Products What's New Industry Leading Flue Gas Analyzers. The most important factor is that you can understand the environment that you are measuring and know what gas you will need to be monitoring. Find low everyday prices and buy online for delivery or in-store pick-up. 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