... is used to test the sound levelcalibrate the sound level of environment, mechanic,vehicle,ship ... is used to calibrate the sound level meters, test the sound levelcalibrate the sound level of environment, mechanic,vehicle ... sound level 94dB 114dBAccuracy: 0.3dBFrequency: 1000HzDesign for: 1", 1/2"Power supply:1x9V 6F22 batteryDimensions: 142x47x47mmWeight (not including battery): 275g Sound Level Meter ...