0.1dB Resolution Maximum hold function AUX OUTPUT JACKS Standard applied:IEC 651 Type2 Range: A LO (Low) - Weighting: 35- 100dB A HI (High) - Weighting: 65-130dB C LO (Low) - Weighting: 35- 100dB C HI (High) - Weighting: 65-130dB Resolution:0.1dB Frequency Range:31.5Hz to 8KHz Accuracy:∮2dB Dynamic Range:65dB Frequency Weighting:AC Time Weighting:Slow & Fast Maximum Hold:Decay < 1dB/3min Calibration: Electrical calibration by using the internal oscillator (1KHz sine Wave at 94dB) Auxilitary Output: AC conditioned, 0.65Vrms corresponding to each range step, impedance: 600W DC conditioned, 10mV/dB (nominally) Operating Condition: 0oC to 40oC < 80% R. H. Storage Condition:-10oC to 60oC < 70% R.H. Display:3 1/2 digitals Power Supply:one 9V battery Accessorie: Instruction Manual, 9V Battery, Carrying Case, Screwdriver, Windscreen.