This instrument is compatible with several standards of GB/T 3785, IEC 651 Type 2, ANSIS 1.4 Type 2. 
It is widely used to test the sound level of environment, mechanic, vehicle, ship and other noise.Fit for industry environment protecting, working, sanitation, teaching search and other departments.

Display: 10 mm (0. 4") LCD (Liquid Crystal Display)
Function: LP, Leq, LN
Frequency range: 31.5Hz - 8KHz
Measurement range: 
LP: 30~130dB (A) 
35~130dB (C) 
35~130 dB (F) 
Leq: 30-130dB
LN. : 0-100% 
Resolution: 0. 1dB
Accuracy: 1dB
Memory: Maximum value 30 groups
Detection characteristics: Fast / Slow
Built-in calibration signal: 94dB
Max. Hold function
Alarm setting: 30-130
Connector: RS232C
Auto power off
Indicator: Low battery indicator
Power supply: 4x1.5V AAA (UM-4) battery
Size: 236x63x26mm (9.3x2.5x1.03 inch)
Weight: 170g / 0.375lb (including battery) 
Standard delivery: 
1. Main Unit: 1pc
2. Carrying Case: 1pc
3. Operation Manual: 1pc

Optional Accessories: 
1. ND9-B sound level meter calibrator
2. Rs-232 and software
3. External relay