Portable and Reliable CO Detection for Safety and Convenience The Duomo Carbon Monoxide Detector is a portable digital meter designed to provide accurate and reliable CO measurements with ease. Featuring adjustable carbon monoxide alarm levels, this device is perfect for ensuring safety in various environments. With simple two-button operation, the meter is user-friendly and ready to use within 15 seconds of being turned on. Key Features Dual Digital Displays: Shows both current and maximum carbon monoxide levels since power-on. Adjustable Alarm Levels: Eight different values ranging from 25 to 200 ppm with a Geiger counter style audible indicator. Quick Startup: Ready to use wit