Carbon Monoxide Detector Tester

How do you know if your carbon monoxide (CO) detector is working? Use this simple test: Spray a tiny amount of air containing an extra bit of CO directly into the CO detector. This can comes with a slim "red straw" to direct the air stream. The amount of CO contained in this product is miniscule; it only works because the gas is directed at the sensor. One can contains enough for dozens of tests.