SQECH Carbon Monoxide Detectors,6-in-1 Air Quality Monitor Measures Carbon Monoxide/Oxygen/Altitude/Atmospheric Pressure/Tem

6-in-1 Air Quality Monitor:The 6-in-1 multifunctional air quality detector can detect CO concentration range is 0-500PPM, O2 concentration range is 0-30%VOL, atmospheric pressure range is 300-1100hPa, temperature range is 32-122, and humidity range is 0- 95%RH. Audio & Visual Alarms:The Carbon monoxide alarm not only provide audible alarms, but also provide visual reminders so that you can protect your safety in time. High Performance Gas Detector:The carbon-monoxide detector has a built-in 1500