LCD Screen Audio Vioce Describe Meter Decibel Monitor Pressure Tester Sound Level Meter with USB Digital Noise Tester 

Features:
Sound Level Range: 30dB~130dB.
Automatic backlight and analogue bar Graph.
Max value hold function.
Auto Power Off in 10 minutes.
Fast/Slow time weighting Selection.
Weighting A/C frequency selection.
Both AC and PWM signal output are available.
Calendar function.
4700 data record function and data clear function.
With USB interface to provide data record downloading, real-time data sampling analysis, and printing graph & data function.

Specifications:
Measurement of sound level range: 30dB~130dBA, 35~130dBC
Level accuracy: 1.5dB (reference sound pressure standard, 94dB1KHZ)
Resolution: 0.1dB
Frequency response: 31.5Hz ~8.5KHz
Measuring level: 30~130, 30~80, 50~100, 60~110, 80~130
Frequency weighting characteristic: A & C
Time weighting: FAST/SLOW
Sampling rate: 20 times/second
Analogue bar Graph: 1db/1 bar graph
Calendar Accuracy: 30 seconds/day
Data record: 4700

General Characteristics:
Operating temperature and humidity: 0 - 40?, 10-80%RH
Power Supply: 4 * 1.5V AA battery (not included)
Item Weight: about 200g
Dimensions: 256 * 70 * 35mm
Package Size: 26 * 8 * 6.5cm / 10.2 * 3.2 * 2.5in
Package Weight: 438g / 15.44oz

Package List:
1 * Digital Sound Level Meter
1 * AC Output Wire
1 * Sponge Ball
1 * CD Software
1 * USB Interface
1 * English Manual