Save your employees hearing with this simple pendant from 3M

The 3M™ Noise Indicator NI-100 is a sound level meter that alerts users to potentially dangerous industrial noise levels, helping identify areas where noise control is an issue and where hearing protection may need to be worn. One of the most affordable noise detection options available for monitoring noise levels, with a durable, small, lightweight design. Easy to use. Simply clip the Noise Indicator to a shirt or jacket. To turn on, press and hold button until double green/red light flashes. Rechargeable battery that operates for up to 200 hours between charges. Recognized as one of the most innovative, high quality and revolutionary ideas in technology by Popular Science. Named among the "Top 100 Most Outstanding" products of 2011 and recipient of the "Grand Award" in Home Technology. Flashing Green indicates noise level is below 85 dBA. Flashing Red indicates noise level is above 85 dBA and hearing protection may be needed.