Abstract: An apparatus for detecting and indicating the presence of combustion products comprising a first combustion product monitor for monitoring for the presence of a first combustion product and quantifying said first product; a second combustion product monitor for monitoring for the presence of a second combustion product and quantifying said second product; and, an alarm connected to the first and second combustion product monitors for triggering an alarm when an alarm condition is satisfied, said alarm condition being at least one of the group consisting of the quantified presence of the first combustion product exceeding a first-product threshold level and the quantified presence of the second combustion product exceeding a first second-product threshold level; and, the quantified presence of the second combustion product exceeding a second second-product threshold level.