WIDE APPLICATION: This sound level meter is suitable for monitoring sound quality in factories, offices, homes, schools, theaters, audio systems and construction sites. MAIN FUNCTION: With maximum and minimum hold function.Data hold function.Red backlight alarm and buzzer alarm.Auto or manual power off function.Temperature measurement function.30-130DB: The measurement range is 30-130dB, which is very suitable for measuring sound or noise. (Normal conversation sound is 40-60dB). HIGH ACCURACY: This sound level meter is a high sensitivity sensor, which is quick to measure and more accurate. CLEAR READING: The product adopts 4-digit display, which makes the reading data more clear and convenient.Note: The data are all manual measurement, please allow 1-3cm error, in Due to the light and display difference, there will be some color difference, depending on the physical item received.