1,Digital Display with dynamic Graph 2,Auto / Manual Range 3,Max Hold, F/ S Response, A/ C Weighting 4,DC/AC Output Measuring Range30~130dBA 35~130dBCAccuracy±1.5dBFrequency Range31.5HZ-8.5KHZLinearity Range50dBAC/DC Output√Auto Power Shut Off√Low Battery Indication√Over Range Indication√LCD Digit5 DigitsTime Weighting SelectionFast/SlowMicrophone1/2 Inch Electret Condenser MicrophoneFrequency ...