30-130DB: The measuring range is 30-130dB, which is very suitable for measuring sound or noise.(The sound of a normal conversation is 40-60dB). WIDE APPLICATION: This sound level meter is suitable for sound quality control in factories, offices, homes, schools, theaters, audio systems and construction sites. MAIN FUNCTION: With maximum and minimum hold function. Data hold function. Red backlit alarm and buzzer alarm. Automatic or manual power off function. Temperature measurement function. HIGH ACCURACY: This sound level meter is a high sensitivity sensor, fast measurement and more accurate. CLEAR READING: The product adopts 4-digit display, which makes the reading data clearer and more convenient. Specifications: Brand: SMART SENSOR Model: ST9604 Measuring Range: 30-130dBA Accuracy: 1.5dB of reference SPLpoint to 94dB at 1KHz Frequency Weighting: A weighting Frequency Range: 31.5Hz-8.5KHz Sampling Rate: 2 times/second Data Hold: Maximum and Minimum Hold Digital Display: 4digits Resolution: 0.1dB Temperature Measurement Range: 10C~5014F-122F) Accuracy: 2 Resolution: 0.1 Microphone: 1/2inch Electret Condenser Microphone Power Supply: AAA Battery X 3 (not included) Package List: 1 * Sound Level Meter