SMART SENSOR AS824 Handheld Larger LCD Screen Display Digital Sound Level Meter  Noise Decibel Meter 30~130 dB Noise Meter Features& 65306; 1. This unit was designedaccording to the IEC651 TYPE2 & ANSI S1.4 type2 for sound level meters 2. Instantaneous sound measure function 3. Measurement range: 30-130decibel 4. With two equivalent weighted sound pressure levels. A and C 5. Fast & Slow dynamic characteristic modes 6. AC and DCsigned output for requency analyzer level recorder, FFT analyzer, graphic recorder etc. Specifications& 65306;       Material     ABS Plastic         Digit & Resolution         5 digits & 0.1dB Display: 0.5 secretary         Measuring Range     30~130dBA 35~135dBC         Accuracy     ±1.5dB         Frequency Range     31.5Hz to 8.5K Hz         Linearity Range     50dB         Frequency Weighting     A, C         Microphone     1/2 inch Condenser Microphone          Standard         According to IEC651 TYPE 2 & ANSIS1.4 TYPE 2         Time Weighting     Fast / SLow         Bar Graph        50 dB scale at 1 dB step fro monitoring current sound pressure level display period: 50mS         Level Ranges          30-80dB; 50-100dB; 60-110 dB; 80-130dB         Over Indicate Over Range       Under indicate less than lower limit for the range                                                AC Output           0.