Sound Level Meter is a portable pocket-sized noise measuring instruments, built-in microcontroller, and its performance in line with the requirements of GB3785 and IEC61672 standard on the 2 sound level meter, it has a small size, light weight, easy to carry, the figures show that night-backlit display, The maximum value to maintain the advantages of battery-powered, AC / DC output is ideal for measuring traffic noise, industrial noise and other noise monitoring instruments. 

 Second, the main technical performance 
 1, Microphone: 1/2 inches (Ф12.7mm) electret test microphone 
 Sensitivity: 30mV/Pa 
 Frequency Range: 20Hz ~ 12 500Hz 
 2, the measuring range: 35dB ~ 120dB 
 35dB ~ 90dB (L) 
 60dB ~ 120dB (H) 
 3, Frequency Range: 20Hz to 10 000Hz 
 4, the frequency weighting: A, C 
 5, the time weighting: F (fast) 
 6, detector: LMS valid value, peak factor ≥ 3 
 7, indicator: 2 × 8 character type LCD, resolution 0.1dB, readings per second update. 
 Accuracy class: meet the requirements of GB3785 and IEC61672 standard on the two machines. 
 9, the reference sound pressure level: 94dB 
 10, refer to the incident direction: microphone axial 
 11, power supply: a 6F22 9V battery, the whole power consumption is not greater than 15mA 
 12, Dimensions: (l × b × h): 170 × 52 × 24mm