... , CE RS-232 interface VC8145 4 7/8 bench top digital multimeter DMM 80000 digit Feature:1,Large LCD,High contrast ... ;4,Frequency measuring can rearch 80MHz;5,Standard function generator:18 kinds of frequency,1%-99% Duty cycle,1800 pcs wave ... limit area measuring;17,photoelectricity insulation RS-232 computer interface;18,Timing measuring function;19,AC measuring adopt High accuracy RMS ...