Koolertron(TM) Digital Sound Pressure Level Meter 30 ~ 130 dB Decibel USB Noise Measurement With SD Memory Card

Features:
Plotted graph and recorded data are printable
High accuracy up to ±1.5 dB
With 2 equivalent weighted sound pressure levels A and C
FAST / SLOW time weighting selection
Maximum value hold function
Automatic power off when idle for 10 minutes
Bar graph indication for sound level range
Tested compatible with Microsoft Windows XP / Vista / 7 (32 bit and 64 bits)

Specifications:
LCD display: 4 digits
LCD size: 2.2 inch (55 mm)
Display: 0.5 secretary
Measuring Level: 30 ~ 130 dB(A) Accuracy: ±1.5 dB
Frequency Response: 31.5 Hz ~ 8.5 kHz
Resolution: 0.1 dB
Sound Level: 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: 50 dB / 100 dB
Frequency Weighting Characteristic: A / C
Analog Bar Graph: 1 dB / 1 bar graph
Sampling Rate: 20 times / second
PWM Signal Output: duty cycle = 0.01 x dB value x 100% / 3.3
Dynamic Characteristic (Time weighting): FAST(high speed) / SLOW(low speed)
Calendar Accuracy: ±30 seconds / 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.
Dimensions: approx. 256 (L) x 70 (W) x 35 (H) mm (10.1 x 2.8 x 1.4 inch)
Weight: approx. 308 g (without battery)

Package Include:
1 x Professional Sound Level Meter
1 x Sponge Ball
1 x USB Cable
1 x Software CD
1 x SD memory card(512M)
1 x English Instruction Manual