This equipment has been designed to meet the measurement requirement of Safety Engineers,Health,Industrial Safety offices and Sound Quality control in environment,which include factory,office,traffic,family,and audio system. This is an easy to use and handy Mini Sound Level Meter. Designed for sound quality control that measures sound level from 30dBA up ~ 130dBA. It has auto range, wide measuring and frequency range (31.5Hz ~ 8.5KHz), maximum hold, Frequency Weighting A and Auto Backlight. Just press one button readings are instantly displayed. A practical little tool great for noise pollution monitoring, home theater setup, health and safety compliance, vehicle noise testing, etc. Auto backlight has a light sensor on top of LCD that detects environment lighting condition. Lighting display intensifies as the environment lighting condition gets darker. The darker the enronment the brighter the illumination. Also, it it reads in and provides windscreen to filter-out unwanted signals. size:57x36x149mm Material:ABS colour:white Package Contents: 1 * Mini digital noise meter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.