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 buzzer alarm.Auto or manual power off function.Temperature measurement function.30-130DB: The measurement range is 30-130dB, which is very suitable for measuring sound or noise. (Normal conversation sound is 40-60dB). HIGH ACCURACY: This sound level meter is a high sensitivity sensor, which is quick to measure and more accurate. CLEAR READING: The product adopts 4-digit display, which makes the reading data clearer and more convenient.FeaturesThis instrument is a high-precision sound level meter with an accuracy of +/- 1.5dB.1)Measurement range: 30~130db2) Frequency weighting: a weighting3) Max and Min hold function4) Data storage function.5) Red backlight alarm and sound alarm6) Automatic or manual shutdown7) Temperature measurement function.8) Choice of the unit of temperature ("C i" f)Specifications:Brand: SMART SENSORModel: ST9604 Measurement range --- --- 30-130dBA Accuracy --- --- 1.5 dB reference SPL point at 94 dB at 1 KHz Frequency weighting --- --- A weighting Frequency range --- --- 31.5 Hz-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 --- --- 2Resolution --- --- 0.1Microphone --- --- 1/2inch Electret Condenser Microphone Power Supply --- --- AAA battery X 3 (not included) Package List: 1 * sound level meter, 1 * instruction manual Description: The product uses a 4-digit display to read the data more clearly and easily. sound or noise.With maximum and minimum retention function. Data hold function. Red alert with backlight and audible alarm. Automatic or manual shutdown. Temperature measurement function. Sorry, sorry. With high sensitivity, fast measurements and more accurate sensors. Suitable for solid quality control in factories, offices, apartments, schools and construction sites. Note: the data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.