How to Use It in Class
- Open this page on the computer connected to your board and tap Start Measuring.
- Tap Traffic Light Mode, then set "Too loud above" for the activity: around 55 dB for quiet work, 65 to 70 dB for group work.
- Green means fine, amber means getting loud, and red means too loud.
The meter uses the Slow response (1 second), so it follows the room’s overall level. Slow response ignores single claps and keystrokes.
Calibrate the Computer’s Mic
Computer and webcam mics often read 20 dB or more too high, so a quiet room can show over 50 dB. Tap the line under the reading, then Set Quiet Room, and keep the class quiet for 5 seconds. The meter then reads 35 dB for that room.
Typical Classroom Levels
A quiet class working alone is usually 45 to 55 dB. Group work is often 60 to 70 dB, and a noisy class can pass 80 dB.
The empty room matters too. The US classroom acoustics standard limits background noise from ventilation, traffic, and the rooms next door to 35 dBA, and our guide to acceptable noise levels in a classroom explains how that limit is set.
For a child who is sensitive to noise, or a loud school event, our kids’ ear defenders guide covers fit and sensory needs.
Keeping the Room Quieter
The meter shows the level, but routines bring it down. For ideas, see The Edvocate’s 22 strategies for quiet time in the classroom.