... Function:Lp,Leq,LE,Lmax,Lmin 3).RS-232 Interfac Sound Analyzer with 1/3 Octave Capability TES-1358 TES-1358A ... /2-inch Electret condenser microphoneAccuracy +/- 1.5dB (ref 94dB @ 1KHz)Measurement range 30dB to 130dBMeasurement function Lp , Leq , LE , Lmax , ... weighting Fast , SlowDisplay 160x160 dot matrix display with back light Sound level meter display Numerical : 4 digits, up data cycle 0 ...