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Introduction: This Noise Meter Decibel Meter Tester has been designed to meet the measurement reauirement of safety engineers,health,industrial safety offices and sound quality contaol in various environment ,which include factory ,traffic ,family and audio sysytem. Features: High accuracy up to ±1.5 dB Resolution: 0.1 dB Wide measuring range: 30 ~ 130 dB DC 9V 2000mA supply. Max Hold With 2 equivalent weighted sound pressure levels A and C Specifications: The Digital Sound Meter don't support SIM CARD just Real-time data sampling analysis Conformed to the IEC651 Type2 and ANSIS1.4 Type2 standards Measuring Level: 30 ~ 130 dB(A) (automatic) Sampling Rate: 2 times / second below 2000 meter in height Operating condition: 0-40 Degrees Celsius 10-70%RH Storage Environment:-10-50 Degrees Celsius 10-80%RH Dimensions: approx. 194x109x26mm Weight: approx. 378g Package Includes: 1 x Professional Sound Level Meter 1 x Adapter 1 xEnglish Instruction Manual Caution: Do not operate the meter at high Humidity environment. Please unplug the power from the power jack. The meter use only at indoor