Measure the surrounding sound (dB) and noise with your computer's microphone! Sound Meter (Noise & Decibel) extension enables you to measure the surrounding sound (dB) and noise with your computer's microphone. This add-on help you easily measure some sound factors, such as the sound level in decibel, noise level, sound average and normalized sound value. When you open the app for the first time, it may ask you about the microphone access. Please accept the dialog box in order to start the add-on. Also note that, the app may take few seconds before getting ready. So please be patient while the add-on is getting ready. Once the loader is disappeared, the add-on is ready to use. It uses the microphone in your system to capture the surrounding sound. If your computer does not have a microphone, please attach one before using the add-on.