Features: _x000D_ 1. 100% brand new and high quality _x000D_ 2. This meter has instantaneous sound measure function. _x000D_ 3. The measurement range is 0?130 dB _x000D_ 4. It has two equivalent weighted sound pressure levels, A and C. _x000D_ 5. Suitable for AC and DC signed output for frequency analyzer level re corder, FFT analyzer, graphic recorder etc. _x000D_ _x000D_ Specification: _x000D_ Condition: 100% Brand New _x000D_ Brand: SMART SENSOR _x000D_ Model: AS824 _x000D_ Accuracy: 1.5 dB(under reference conditions) _x000D_ Frequency range: 31.5 Hz to 8.5KHz _x000D_ Linearity range: 50dB _x000D_ Measuring level: 30?130dBA,35?130dBC _x000D_ Frequency weighting: A,C _x000D_ Digital display: 5 digits _x000D_ Resolution: 0.1dB _x000D_ Display: 0.5 secretary _x000D_ Bar graph: 50 dB scale at 1 dB step for monitoring current sound pressure level display period: 50 mS _x000D_ Level ranges: 30?80 dB; 50?100dB; 60?110dB; 80?130dB; _x000D_ Over indicate over range: Under indicate less than lower limit of the range. _x000D_ AC output:0.707 Vrms at FS output impendance approx 600 _x000D_ DC output:10 mV/dB output impedance approx 100 _x000D_ Time weighting: Fast/Slow _x000D_ Microphone: 1/2 inch Electret Condenser microphone _x000D_ Max: Maximum hold _x000D_ Power supply: 9V battery(not included) orDC9V 100mA _x000D_ Self calibration time: 10 sec(every turn on) _x000D_ Operating Temperature: 0 to 40 _x000D_ Operating Humidity: 10% to 80% RH _x000D_ Storage Temperature: ?10 to 60 _x000D_ Storage Humidity:10% to 70% RH _x000D_ Weight: Approx. 664g / 23.4oz _x000D_ Size: Approx. 224 * 66 * 33mm / 8.8 * 2.6 * 1.3in _x000D_ _x000D_ Package List: _x000D_ 1 * Digital Sound Level Meter _x000D_ 1 * Power Supply DC 9V Cable _x000D_ _x000D_ _x000D_ Note:_x000D_ New-style and old-style are shipped randomly