Test, TEST or Tester may refer to: Test (assessment), an assessment intended to measure the respondents' knowledge or other abilities Medical test, to detect, diagnose, or monitor diseases == Science and technology == test (Unix), a Unix command for evaluating conditional expressions TEST (x86 instruction), an x86 assembly language instruction Experiment, a part of the scientific method Test (biology), the shell of sea urchins and certain microorganisms Test method, a definitive procedure that produces a test result Physical test Chemical test, a procedure designed to prove the existence of, or...

A smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial security devices issue a signal to a fire alarm control panel as part of a fire alarm system, while household detectors, known as smoke alarms, generally issue a local audible or visual alarm from the detector itself. Smoke detectors are housed in plastic enclosures, typically shaped like a disk about 150 millimetres (6 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary. Smoke can be detected either optically (photoelectric) or by physical process (ionization), detectors may use either...

A smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial security devices issue a signal to a fire alarm control panel as part of a fire alarm system, while household detectors, known as smoke alarms, generally issue a local audible or visual alarm from the detector itself. Smoke detectors are housed in plastic enclosures, typically shaped like a disk about 150 millimetres (6 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary. Smoke can be detected either optically (photoelectric) or by physical process (ionization), detectors may use either...