... 651, Type 2 Class Decibel Meter AZ-8922(30-130dB) with Free Shipping AZ-8921 & 8922 ... 2400Baud rate, 1 Stop bit, 8 Data bits. N: xxx, xdB Monitor the sound levels from traffic noise ... -Freguency calibration to ensure quality stable.SPECIFICATION Auto range :30-130dB. Big LCD :42x64mm. Measurement level range : ... 6 ranges in 10-dB steps:30-80dB, 40-90dB, 50-100dB, 60-110dB, 70- ...