Traffic lights used for noise control in school. Ours was in the cafeteria. If it was green, it was ok to talk. If it was yellow, you needed to quiet down. If
Yacker Tracker Noise Level Monitor Detector - Visual LED Traffic Signal Light - Great for Schools, Classrooms, Cafeterias, Hospitals and More - 17" by LEARNING ADVANTAGE - Shop Online for Toys in Australia
A Noise Level Meter built for the Classroom. | Too Noisy
Teacher's Pet » Editable Traffic Light Noise Posters
Deluxe Yacker Tracker with Remote Control Noise Monitor Stop Light AGI | eBay
Printables for Monitoring Classroom Noise Levels (Noisometer) - SparkleBox
Yacker Tracker Noise Level Monitor Detector - Visual LED Traffic Signal Light - Great for Schools, Classrooms, Cafeterias, Hospitals and More - 17" by LEARNING ADVANTAGE - Shop Online for Toys in Australia
Buy Yacker Tracker® Noise Level Monitor at S&S Worldwide
Teacher's Pet » Editable Classroom Noise-Ometer
Printables for Monitoring Classroom Noise Levels (Noisometer) - SparkleBox
Innovating with an Arduino: Traffic Light Noise Meter | David Valeri's Blog
Classroom Management - A Neat Way To Use A Noise Level Tracker In Your Classroom - Susan Fitzell
Noise Control Traffic Light | Preschool social skills, Classroom learning, Traffic light
Noise traffic lights | TPT
QUIET LIGHT™ Classroom Noise Monitoring Traffic Light | ASI
Classroom Noise Level Indicator - Traffic Light :: Teacher Resources and Classroom Games :: Teach This
Traffic Light Noise Level Expectations | Kristy's Blog
Innovating with an Arduino: Traffic Light Noise Meter | David Valeri's Blog