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.
