Features: 1. 100% brand new and high quality 2. Adopt condenser microphone as the sensor, high configuration MCU calculation, high accuracy, fast response. 3. Color LCD display with backlight can provide clear reading for you. 4. It has measuring MAX, Min, data hold function and over range indication. 5. Suitable for factory, school, construction, etc. Specification: Condition: 100% Brand New Model: UA961 Applied Standard IEC61672-1 CLASS2 Measuring level range 35dB-135dB Dynamic range 50dB Frequency range 31.5Hz-8KHz Accuracy ±2.0dB Frequency weighting A frequency weighting Time weighting FAST: 125ms/ SLOW: 1s Microphone 1/2 inch electrets condenser microphone High/low reading indication >100dB, LCD displays"Hi" <100dB, LCD displays"LO" Temperature range -20℃-70℃/-4℉-158℉ Temperature accuracy ±1.5℃/2.7℉ Resolution 0.1 Data update 300ms Battery life at least 60 hours Enable/Disable Auto power off The meter shuts off automatically after 15 minutes inactivity under auto power off mode, disable auto power off is available Battery 3*1.5V AAA batteries(not included) Operating conditions -20℃-60℃/-4℉-140℉,10RH%-90 RH% Storage conditions -20℃-60℃/-4℉-140℉,10 RH%-75 RH% Size: Approx. 144 * 56 *30.5mm / 5.7 * 2.2 * 1.2in Package List: 1 * Digital Sound Level Meter 1 * User Manual .