30-130DB: The measurement range is 30-130DB, which is very suitable for sound or noise measurement. (Normal conversation sound is 40-60dB). Widely used: This sound level meter is suitable for sound quality monitoring in factories, offices, homes, schools, theaters, sound systems, and construction sites. Main function: It has maximum and minimum holding functions. Data retention function. Red backlight alarm and buzzer alarm. Automatic or manual power off function. Temperature measurement. High precision: This sound level meter is a highly sensitive sensor with fast measurement speed and greater accuracy. Clear reading: This product adopts a 4-digit display, making reading data clearer and more convenient. Specifications: Brand: Intelligent sensor Model: ST9604 Measurement range: 30-130dBA Accuracy: 1.5 dB reference SPL point, 94 dB, 1 KHz Frequency weighting: a weighting Frequency range: 31.5Hz-8.5KHz Sampling rate: 2 times/second Data retention: maximum and minimum retention Digital display: 4 digits Resolution: 0.1dB Temperature measurement range: 10C~5014F-122F) Precision: 2 Resolution: 0.1 Microphone: 1/2-inch electret capacitor microphone Power supply: AAA battery X 3 (not included) Package List: 1 * Sound level meter