... ,manufacturing and sales integrated company. Our products include laser distance meter,infrared thermometer, anemometer, sound level meter, noise meter, vibration meter, ultrasonic thickness gauge, film/coating thickness gauge, digital ... 50~100, 60~110, 80~130frequency weightingA(simulative ear)& C(noise of machine itself)time characteristicsfast/low reaction ratesampling frequencytwice/smicrophone1 ...