A radon detector is a device used to measure the level of radon gas in indoor environments. Radon is a naturally occurring radioactive gas that can seep into buildings from the ground. Prolonged exposure to high radon levels can increase the risk of lung cancer. Radon detectors help identify dangerous levels so that action can be taken to reduce exposure. There are short-term and long-term radon detectors available. Short-term detectors test for a few days, while long-term ones monitor over several months. Digital radon detectors provide real-time readings and are reusable. Most detectors are easy to use and require minimal setup. Regular testing is important for home safety, especially in areas prone to radon.