Cadrim Digital Sound Level Meter Portable Data Logger Decibel Noise Tester 30 130dB Auto OFF Alarm Function Max/Min Hold Measure LCD Screen 9V Battery Measurement

【Please Note】1. When display 20-40 dB, it is normal in a quiet room where no one is talking. The sound of normal conversation is 40-60dB. 2. If you have any questions or problems, please contact the seller directly for help~ Do not return it directly. 【Fast & Precise】Accuracy within +/- 3.5dB; resolution: 0.1dBA; response speed: 0.5 seconds; time level: fast response (125mS); Sound level frequency weighting: A 【Auto Shutdown & Alarm Function】Automatic shutdown after 15 minutes without any operation; "OL" will be displayed when the input exceeds the range. 【High Quality LCD Screen】High display quality, low eye damage, low power consumption, low radiation. 【1/2" Polarized Condenser Microphone】Great tool for checking, monitoring or controlling the sound level of any environments.