Code: 11640250-39 The Smoke Detector Test Spray can quickly and reliably test the functional capability of optical and photoelectric smoke detectors without additional testing tools. WEICON Smoke Detector Test Spray does not contaminate detectors as the spray evaporates without residue. WEICON Smoke Detector Test Spray can be used in all applications including photoelectric fire detectors – for example, in industrial facilities, public facilities or private residences.