Koolertron Digital Sound Pressure Level Meter 30 ~ 130 dB Decibel USB Noise Measurement

Features
Suggest using products bring SD card
Real-time data sampling analysis
Plotted graph and recorded data are printable
FAST / SLOW time weighting selection
Bar graph indication for sound level range
Date and time of the unit can be synchronized to that of user's PC
Large LCD screen with 4 digits reading
Tested compatible with Microsoft Windows XP / Vista / 7
Specifications
LCD display:4 digits
LCD size: 2.2 inch (55 mm)
Display:0.5 secretary
Measuring Level: 30 ~ 130 dB(A)(A-weighted decibels),35 ~ 130 dB(C)(C-weighted decibels)
Accuracy:±1.5 dB
Frequency Response: 31.5 Hz ~ 8.5 kHz
Resolution: 0.1 dB
Sound Level: 30 ~ 130 dB with Level selecting button switches
Level 1: 30 ~ 80 dB
Level 2: 50 ~ 100 dB
Level 3: 60 ~ 110 dB
Level 4: 80 ~ 130 dB
Level 5: 30 ~ 130 dB
Dynamic Range:50dB / 100dB
Overload Indication:OVER/UNDER
Frequency Weighting Characteristic:A/C
Analog Bar Graph: 1dB/1bar graph
Sampling Rate: 20 times/second
PWM Signal Output: duty cycle=0.01xdB value x 100%/3.3
Dynamic Characteristic (Time weighting):FAST(high speed)/SLOW(low speed)
Calendar Accuracy:±30seconds/day
Microphone:0.5 inch polarization capacitance microphone
Power Supply:4 x 1.5V AA battery (not include)or USB Cable
Power Life: about 20 hours continuous use (alkaline battery)
Operating Temperature: 0 ~ 40 °C(32 ~ 104 °F)
Operating Humidity:≤80 % R.H.
Package Includes
1 Professional Sound Level Meter
1 Sponge Ball
1 USB Cable
1 Software CD
1 SD memory card(512M)
1 English Instruction Manual