Sound meter Features: - Indicates decibel by gauge - Display the current noise reference - Display min/avg/max decibel values - Display decibel by graph, easy to understand The high decibel value will be harmful to your physical and mental health and hearing function. You'd better avoid exposure in noisy environments.To protect your and your family's health, detect the decibel value now! Do not hesitate, Come and download Sound pressure level(SPL) meter app now.