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Understanding Sound and Noise Levels Environmental Noise Weakest sound heard 0dB Whisper Quiet Library at 6' 30dB Normal conversation at 3' 60-65dB Important Links for Sound and Noise OSHA United States Department of Labor http://www.osha.gov/SLTC/noisehearingconservation/ OSHA United States Department of labor eTool Technical Manual http://www.osha.gov/dts/osta/otm/noise/ I Sound and Noise Exposure Facts Any exposure to noise above 85dB can damage the human hearing; as a rule of thumb, the ambient sound is too loud if you can not carry on a conversation without raising your voice. Occupational noise Ultrasonic Leak Detection: How Does it Work? Ultrasonic Leak Detection   How does it work??? As the name implies ultrasonic leak detectors detect the ultrasonic sound of a leak. You are probably familiar with April 2013 Newsletter                            TI-25M: Changing Calibration – Two-Point Calibration Procedure Courtesy of Electromatic/Checkline NOTE: This procedure requires two samples with ”known” thickness values are available during this calibration. The two samples should be at the high and l