Carbon Monoxide is invisible and deadly. That is why it is so important to install a CO alarm and perform a regularly CO Alarm Test it to check that both its battery and its gas sensor are working to protect you and those around you. Detectagas is a multi-award winning, patented universal test kit for use with all domestic CO alarms. It safely tests the battery and sensor in your alarm to ensure it will alarm if CO becomes present. The calibrated test gas kit enables users to safely test CO alarms as you cannot safely generate a controlled and sufficient amount of CO by any other method without risk of harm. ✓ Simple to use ✓ Entirely safe ✓ Sensor inclusive test ✓ Calibrated test gas ✓ 11 tests per can ✓ Low cost per test ✓ Sensor tests all CO alarms manufactured to BS EN 50291 & UL 2034