Features:The product adopts 4-digit display, which makes the reading data clearer and more convenient.High sensitivity sensor, fast measurement and more accurate.The measuring range is 30-130db, which is suitable for the measurement of sound or noise in most occasions.Suitable for sound quality control in factories, offices, homes, schools and construction sites.With maximum and minimum hold function. Data hold function. Red backlit alarm and audible alarm. Automatic or manual power off function. Temperature measurement function.Specifications:Brand: SMART SENSORModel: ST9604Measure range30-130dBAAccuracy1.5db reference SPLpoint at 94dB@1KHzFrequency WeightingA weightingFrequency range31.5Hz-8.5KHzSampling rate2 times/secondData HoldMaximum and Minimum holdDigital display4digitsResolution0.1dBTemperature measurement range-10C~5014F-122F)Accuracy2Resolution0.1Microphone1/2inch Electret Condenser MicrophonePower supplyAAA battery X 3 (Not included)Package List:1*Sound Level Meter1*Instruction Manual.