Reliable carbon monoxide alarms from reputable companies are Kitemarked to the relevant British Standard – BS 50291 Part 1, and optionally Part 2 as well, outlining the manufacturing and testing of “electrical apparatus for the detection of carbon monoxide.” Part 1 of the Standard deals with alarms designed for use in domestic premises and is sufficient for the majority of customers. BS 50291-2 compliance builds on Part 1 requirements and means that the alarms are suitable for “recreational vehicles” such as caravans, but also covering camping in tents, while an optional extra test allows companies to certify their alarms for use in boats as well.