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 backlight 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: Brand: SMART SENSOR Model: ST9604 Measuring range: 30-130dBA Accuracy: 1.5 dB reference SPLpoint at 94 dB at 1 KHz Frequency weighting:One weighting Frequency range:31.5Hz-8.5KHz Rate sampling rate: 2 times / second Data hold: Maximum and minimum hold Digital display: 4digits Resolution: 0.1dB Temperature measuring range:10C~5014F-122F) Accuracy:2 Resolution:0.1 p> Microphone: 1/2inch electret condenser microphone Power supply: AAA battery x 3 (not included) Package list: 1 * sound level meter ladaceae