WIDE APPLICATION: This sound level meter is suitable for sound quality monitoring 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.30-130DB: The measuring range is 30-130dB, which is very suitable for measuring sound or noise.(Normal conversation sound is 40-60dB).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.FeaturesThis instrument is a high-precision sound level meter with an accuracy of +/- 1.5db.1) Measuring range: 30~130db2) Frequency weighting: A weighting3) Max and Min hold function4) Data storage function.5) Red backlight alarm and audible alarm6) Automatic or manual shutdown7) Temperature measurement function.8) Choice of the temperature unit ("C i" f)Specifications:Brand: SMART SENSORModel: ST9604 Measuring range --- --- 30-130dBA Accuracy --- --- 1.5 dB of reference SPL point at 94 dB at 1 KHz Frequency weighting --- --- One 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. The measuring range is 30-130 decibels and is suitable for measuring sound in most cases. sound or noise. With maximum and minimum retention function. Data retention 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: Data are all manual measurements, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received.