A detecting device is a tool used to detect the presence of an object or phenomenon. RADAR, sonar, SENSOR, and NOSE are all examples of detecting devices. RADAR is an acronym for Radio Detection and Ranging, which uses radio waves to detect objects and measure their distance. Sonar stands for Sound Navigation and Ranging, which uses sound waves to detect objects underwater. Sensors are electronic devices that detect changes in the environment and send signals to a control system. Finally, a NOSE is a biological detecting device that detects smells.