Abstract: A composition for use in testing smoke detectors, comprises a polyhydroxy alcohol and a surface-active agent.

Abstract: A test apparatus for testing a detector such as a smoke detector or the like comprises a housing member pivotally mounted on the end of a pole and containing a test element for testing the detector. The housing member has an opening and is adapted to be placed over the detector under test. The presence of the detector within the housing member is sensed using a non-contact arrangement such as a photo-electric system and causes the tests to be activated to test the detector. A power supply for the test element is mounted in or on the pole adjacent the housing member and power is supplied to the test element using electrically conductive members which provide both mechanical and electrical connection between the housing member and the pole.