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OSHA Caution Industrial Decibel Meter Sign: Ear Protection Required When The Sound Level Is Greater Than 85 dB English 12" x 10" Aluminum Face 1/Each - SCS601 - Jendco Safety Supply
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Amazon.com: Mengshen Decibel Meter, Digital Sound Level Meter Handheld Audio Noise SPL Meter Tester with LCD Display Measuring 30-130dB (9V Battery Included) : Industrial & Scientific
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