CRC Smoke detector test spray conveniently tests the functional ability of a smoke detector. CRC Smoke detector test spray can be sprayed while standing on the floor eliminating the need to climb ladders or chairs. CRC Smoke Test is ideal for residential or commercial detectors and is safe and easy to use. A short 3 second burst of CRC Smoke Test is all it takes. In addition, CRC Smoke checks for obstructions or debris which clog detector vents and prevent smoke from properly entering the sensing chamber. This important safety test is not accomplished by pushing a test button.