In the last post you may have noticed my Buddy Portable propane heater, and had an aneurysm imagining the CO buildup in an enclosed truck cap. Fear not. While the Buddy heater does have an O2 meter on it, you should really use a secondary CO detector. CO combines with hemoglobin and prevents your blood from carrying oxygen. It doesn’t matter how much O2 you’ve got, you can still die from high enough CO levels. I bought a monitor that has an LCD readout so I can get real-time and peak CO levels in PPM. It’s a little peace of mind. I also added a smoke detector because I like not dying in fires.