Measuring Range : 30~ 130dB A : 35~ 130dB C Level Range Control Switch : 30dB to 80dB : 50dB to 100dB : 60dB to 110dB : 80dB to 130dB Frequency Range : 31.5HZ-8.5KHZ Linearity Range : 50dB Digit & Resolution : 5Digits & 0.1dB Bar Graph : 50dB scale at 1dB step monitoring Time Weighting Selection : Fast for normal measurement Slow for checking AVERAGE level of fluctuating noise Frequency Weighting : A weighting for general sound level measurement C weighting for checking low frequency content of noise Microphone : 1/ 2 Inch Electret Condenser Microphone Sampling Frequency : 2 times/ sec Power Source : 9 Volt alkaline battery or 9Volt DC adaptor Dimensions : 265( L) × 72( W) × 35( D) mm Weight : 300g approx.