Review on 🔍 Portable CO Gas Detector, Handheld Carbon Monoxide Meter with 0-1000ppm Range, 1PPM Resolution (Battery NOT Included) by Johnny Black

Purchased to warn me about carbon monoxide levels when camping offline and using propane for heating. I've used this several times and it works great. You can set the alarm to sound at any level you want (I set it low for safety), and the battery lasts for days. Never unplug your indoor campground or heat it with propane or any other potentially toxic heat source without a pollution level control tool! TAKE CARE OF YOURSELF! :)