1、LCD Color Screen: This sound level reader features an LCD color screen with an analog bar scale for a clear display so you can get a clear picture of the ambient noise situation. 2、High Accuracy: This noise decibel meter is highly accurate, with an accuracy of ±1.5dB and a measurement range of 30.0‑130dB, which can be used for sound detection in a variety of situations. 3、Multifunctional: This decibel detector is multifunctional, and provides A, C, and Z frequency weighting and fast and slow options, Fahrenheit and Celsius displays, calibration settings, maximum, minimum, average, and hold functions. 4、Manual Adjustment Up And Down Thresholds: This sound level reader will alarm with buzzer and indicator when the decibel exceeds the set threshold, you can adjust the up and down thresholds manually. 5、Excellent ABS Material: This digital sound level meter is made of excellent ABS material, which is sturdy and abrasion resistant, not easy to be damaged, and has a long service life. Item Type: Decibel Meter Model: TA650A Material: ABS Measuring Range: 30.0-130dBA Accuracy: ±1.5dB (At Reference Sound Pressure Level, 94dB at 1kHz) Resolution: 0.1dB Frequency Weighting: A Weighting Noise Display: 4 Digit Display, Maximum 1999 Frequency Response: 31.5Hz-8kHz Microphone: High Sensitivity 1/2 Inch Electret Condenser Microphone Time Weighting: FAST (Fast) 0.125 Seconds, SLOW (Slow) 1 Second Sampling Rate: 2 Times/Second Auto Power Off: 15 Minutes (Can be Manually Turned Off) Operating Environment: -10-50°C, Maximum 80% Relative Humidity, Indoor Altitude < 2000m Storage Environment: -10-50°C, Maximum 70% Relative Humidity (Battery Removed) Batteries: 1.5V AAA Batteries x 2 (Not Included) 1 x Sound Level Meter 1 x Storage Bag 1 x Manual