UT353 is a mini sound meter which can convert ambient sound into electrical signals, process data and displays results on LCD. It does not have traditional meter issues such as meter being too large, complex operation, and so on. UT353 can constantly monitor ambient sound. It is light weight, compact, ergonomic, and user friendly, making it a great tool for monitoring noise levels in hotels, conference halls, home theater, hospitals, and any other noise sensitive environments.     Functions Range Resolution Accuracy Noise（A Weighting） 30～130dB 0.1dB ±1.5dB Sampling Rate FASH 　 125ms SLOW 　 1000ms Overload Indication 　 　 OL MAX/MIN 　 　 MAX/MIN Data Hold 　 　 HOLD LCD Backlight 　 　 Yes Auto Power Off 　 　 5min Low Battery Indication 　 　 3.0～3.5V Battery 　 　 4.5V Current Consumption Working mA ≤40mA Power off uA ≤10uA Working Environment Temperature 　 0～40℃ Humidity 　 ≤80%RH Storage Environment Temperature 　 -20～60℃ Humidity 　 ≤75%RH Key Functions ON/OFF  Short press to turn on/off the meter MAX/MIN Short press to switch between MAX/MIN/normal measurement state FAST/SLOW Short press to select fast sampling (125ms) or slow sampling (1s) HOLD/BL Short press to enter data hold mode, long press to turn on/off backlight