Genuine CO gas delivery directly to the detector sensing cell — replicates real carbon monoxide conditions for accurate functional testingNon-flammable formula — safe for use in occupied residential and commercial environmentsUL Classified and detector manufacturer approved — meets current CO testing legislation and ULC standardsCompatible with handheld use or Solo 330 and Solo 332 dispensersGenuine CO gas delivery directly to the detector sensing cell — replicates real carbon monoxide conditions for accurate functional testingNon-flammable formula — safe for use in occupied residential and commercial environmentsUL Classified and detector manufacturer approved — meets current CO testing legislation and ULC standardsCompatible with handheld use or Solo 330 and Solo 332 dispensers