1.IEC,ANSI standard 2.measuring range 30~130 dBA,35~130 dBC 3. ... design,manufacturing and sales integrated company. Our products include laser distance meter,infrared thermometer, anemometer, sound level meter, noise meter, vibration meter, ... 100, 60~110, 80~130frequency weightingA(simulative ear)& C(noise of machine itself)time characteristicsfast/low reaction ratesampling frequencytwice/smicrophone1 ...