SensGard - ZEM Hearing Protection
This device blocks harmful noise but still allows voices and other sounds to be heard.
We’ve all heard the term “an ounce of prevention,” but in this case it’s 1.7 oz.–the weight of the new ZEMs hearing-protection system made by SensGard. Sound in the ear canal is directed into a hollow chamber where it is absorbed by a dampening material and cancelled out by reflection from the ends of the tube. After several months of use, I found the noise reduction comparable to earmuffs. Because they are so comfortably small and light, I wear them around my neck and put them on every time I do something noisy.
–Craig Smith is a woodworker in upstate New York.