Extech SL130W Datalogging Sound Level Meter, 30dB to 130dB, 8kHz max

The FLIR Sound Level Alert with Alarm continuously monitor sound levels throughout the day. It has bright LEDs (red flashing or green) alert user when sound level is too high or too low, LEDs can be read from 30m (100ft). It is Ideal for industrial, hospital, auditoriums, schools and other areas where there is a need for being alerted when sound level reaches set points.

Microphone rotates 180° for desired placement
User settable high or low limit (30 to 130dB) indication with output to drive external relay module