... 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 ... , 50~100, 60~110, 80~130* Frequency weighting characteristic: A & C* Time weighting: FAST/SLOW*Sampling rate: 2times/second*Microphone: 1 ...