I bought this to fix an old truck that I suspected had exhaust issues. According to the device no. The air was safe. However, I put it in my girlfriend's car to make sure she was safe. He had been in the car for several months when the exhaust near the engine came loose today. It was very noisy in the car and I completely forgot about that carbon monoxide alarm! Suddenly I hear this warning tone. It was a voice warning us about the high concentration of CO2 in the air! It was around 300 ppm. We immediately opened the windows and turned off the ventilation. We were able to return home SAFELY. Do you know how bad CO2 is for your body? Cars are dangerous, and if your exhaust suddenly breaks at the wrong stop at the wrong time, or if something blocks your exhaust, like mud or snow, you can die. This device works and is cheap. I would not push anyone to buy any other product. Get it and use it. You could buy one for every car. It's very small and even after being in the car for a couple of months stuffed under the seat it worked!
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