30-130DB: The measuring range is 30-130 dB, which is very suitable for measuring sound or noise. (Normal conversation sound is 40-60 dB). 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 backlit alarm and audible alarm. Automatic or manual power off function. Temperature measurement function. HIGH PRECISION: This sound level meter is a high sensitivity, fast measuring and more accurate sensor. CLEAR READING: The product adopts a 4-digit display, which makes the reading data clearer and more convenient. Specifications: Model: ST9604 Measuring range30-130dBA Accuracy1.5dB reference SPLpoint at 94dB at 1KHz Frequency weightingOne weighting Frequency range31.5Hz-8.5KHz Sampling rate2 times/second Data holdMaximum and minimum hold Digital display4digits Resolution0.1dB Temperature measuring range-10C - 5014F-122F) Accuracy2 Resolution0.1 Microphone1/2inch electret condenser microphone Power supplyAAA battery x 3 (not included) /p luckymeet