
I am trying to teach audio volunteers in a church to keep the sound level below 95dB. I used the light signal function. Works perfectly. It flashes and they know they're making too much noise.

Digital multimeter RGK DM-12
6 Review

π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review

Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review

π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review