Did you know your smartphone's sensors can do a lot more than their intended use cases? For example, your phone's gyroscope can act as a bubble level. Similarly, the built-in microphone is quite sensitive and can be used as a decibel meter. By downloading a free noise meter or decibel meter app from your app store, you can measure sound levels around you. This can help you monitor noise exposure at your workplace or check if your modified bike's noise levels are within permissible limits. It's a handy tool for various situations, simply by using an app that measures sound with your smartphone microphone!