OverviewCONVENIENT: Our smoke detector tester sprays up to 6 feet; allowing for use while safely standing on the ground. Active: Tests the functional ability of smoke detectors; checks for obstructions and debris that could block detector openings. Applications: For use on commercial and residential smoke detectors. Product Specifications: The Smoke Detector Tester comes in a 2.5 oz spray can. CRC Industries: A market leader providing impeccably designed chemical solutions to maintain, protect and repair various marine vehicles, heavy duty vehicles, industrial engines, home appliances and electrical equipment.