The sound level meter measures and displays sound levels in dB from 3 to 13 dB. User selectable features include Frequency weighting (A & C), Response Time (Fast & Slow), Data Hold and MAX/MIN recording. Comply with norm of IEC 651 type 2, ANSI S1.4 TYPE 2. Each meter is fully tested and calibrated in factory before delivery. With proper use, it will provide years of reliable service..

Applicable standards IEC61672-1: 213 Class 2
Measurement range Auto:3 to 13d Manual: 3 9dB, 5 11dB, and 7 13dB
Microphone 1/2 inch polarized condenser microphone
Frequency range 31.5~8Hz
Accuracy ±1.5dB ( at reference condition of 94d 1 kHz)
Resolution .1dB
Data update 5ms
Frequency weighting A and C
Response time FAST125 SLOW1 s
Standard calibrator 1KHz sine wave @ 94 or 114dB
Display 3-1/2 digital LCD with analog bar-graph
Over load indication Displa OVER UNDER� icons
Outputs AC/DC signal output from earphone jack
AC=1Vrms DC=1mV/dB
Data output Micro USB
Auto power off Automatically power off if without operation in 2 mins
Power One 6F22 battery or 9V 6LR61
Memory 32 dataonly for LD856
Operating condition ~ C (32 ~ 122 F)1 ~ 9% RHNon-condensing
Storage condition -2 ~ C (- 4 ~ 14 F)1 ~ 9% RHNon-condensing
Weight & dimension 2gincluding battery215mm*58mm*33mm
Accessories Manual, 9V battery, windscreen, USB cable, 9V AC/DC adapt �3  earphone plug�software CD.