SOUND LEVEL METER THIS UNIT WAS DESIGNED ACCORDING TO FOLLOWING STANDARDS: A. INTERNATIONAL ELECTRICIAN COMMITTEE STANDARD: IEC PUB 651 TYPE2 B. US NATIONAL STANDARD: ANSI S1.4 TYPE2 MEASURING RANGE: 30~130 DBA ACCURACY: ±1.5 DB DIGIT & RESOLUTION: 4 DIGITS & 0.1 DB FREQUENCY RESPONSE: 31.5HZ ~8.5KHZ FREQUENCY WEIGHTING CHARACTERISTIC: A SAMPLING RATE: 2TIMES/SECOND MICROPHONE：1/2 INCH POLARIZATION CAPACITANCE MICROPHONE MAX READING AUTOMATIC BACKLIGHT LOW BATTERY INDICATION AUTOMATIC POWER OFF PACKING METHOD: BLISTER + CARD POWER: 9V BATTERY (6F22) DIMENSION: 57*36*149MM WEIGHT: 144G (INCLUDING BATTERY) ORIGIN : GABY INSTRUMENTS DELIVERY : IMMEDIATE