The 3M™ Noise Indicator NI-100 offers easy-to-use, durable and economical noise indicating device that alerts users when noise levels exceed 85dB.
When flashing green, it indicates the noise level is below 85 dBA.
When flashing red, it indicates noise level is above 85 dBA and hearing protection may be needed.
Easy to Use
Clip the Noise Indicator to a shirt or jacket. To turn on, press and hold button until double green/red light flashes.