... RS-232 interface VC8145 4 7/8 bench digital multimeter DMM 80000 digit Feature:1,Large LCD,High contrast,Wide ... ;2,Dual-display:Main display 80000,Vice-display 80000,analog bar 21 sect.,unit,function symbol complete;3,50 ... Continuity test√Overloading protection√Input Impedance10MΩSampling frequency4times/sec. Analog bar40 times/sec.AC frequency response40Hz-50kHzOperation wayAuto rangeMax ...