Decibelmetru MS6700 Mastech engross

Accuracy: +-1.5dB
Response frequency: 31.5Hz-8kHz
Dynamic range: 50dB
Frequency Weighting : A\C
Time weighting: FAST 125ms, SLOW 1sec
Microphone: Electret Condenser microphone
Digital display: 4 digitals, resolution 0.1dB, sampling rate 2 times/s
Analog bar display: Each analog bar is as 1 dB, sampling rate 2 times/s
Measurement ranges: 30-80dB, 40-90dB, 50-100dB, 60-110dB, 70-120dB, 80-130dB, Total of 6 ranges
Auto-range: Micro-computer can choose the best measurement ranges
Over range indicator: UNDER (less than range) and OVER (over range)
AC signal output: 0.707 Vrms at FS (Auto-range mode isn't included) Output impedance approx. 600Ω
DC signal output: 10mV/dB Output impedance approx.100Ω
Power supply: Four LR03 AM4 1.5V SIZE AAA alkaline cells
Power life: About>35hrs (alkaline cells) Cintinuous operation
AC adapter: Voltage 9vDC
Voltage ripple < 100mVpp
Supply Current >100mADC
Socket pin Ground
Casing positive
External Diameter 3.5mm
Operating temperature: 0℃ to 40℃ 
Operating humidity: 10~80%RH
Storage temperature: -10℃ to 60℃
Storage humidity: 10 to 70%RH
Dimensions:245(L)x80(W)x35(H)mm
Weight : Approx. 350g (including battery)
Accessories: Earphone plug, Operation manual, Battery, Windscreen.
Certificate: CE(EMC) RoHS
Display: 2000 counts
Data Logging: 16000 records
Auto Ranging
Auto Power Off
AC Singal Output: 0.707 Vrms at FS (Auto-range mode isn't included) Output impedance approx. 600Ω
DC Singal Output: 10mV/dB Output impedance approx. 100Ω
AC Adapter
-Voltage 9VDC
-Voltage Ripple 100m ADC
-Socket : pin Ground
-Casing Positive
-External Diameter 3.5mm
Fast
Low
A Weighting
B Weighting
Date and Time Display
MAX
Data Hold
Display Backlight
Low Battery Display
Analog Bar Indication
Over Range Indication
Resolution 0,1dB
Accuracy +-1,5dB
Sample rate 2/sec