Decibel meter signs continuously measure and display sound level to alert workers of the potential need for hearing protection Meter measures from 30 to 130 db with accuracy to within +/- 1.5 db Requires no additional calibration or settings Supports OSHA 29 CFR 1910.95 hearing conservation program requirements Three-digit, bright red led display with 1 1/2 inch numbers Actual sign may appear slightly different vs. provided image