30-130DB: The measurement range is 30-130dB, which is very suitable for sound or noise measurement. (Normal conversation sound is 40-60dB). WIDE APPLICATION : This sound level meter is suitable for monitoring sound quality in factories, offices, homes, schools, theaters, o 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. HIGH PRECISION: This sound level meter is a high sensitivity sensor, fast measurement and more accurate. CLEAR READING: The product adopts 4-digit display, which makes reading data clearer and more convenient. Specifications: Model: ST9604 Measurement range30-130dBA Accuracy1.5dB reference SPLpoint at 94dB at 1KHz Frequency weightingA weighting Frequency range31.5Hz-8.5KHz Sampling rate2 times/second Data holdMaximum and minimum hold Digital display4digits Resolution0.1dB Temperature measurement range-10C - 5014F-122F) Accuracy2 Resolution0.1 Microphone1/2inch electret condenser microphone PowerAAA battery X 3 (not included)