... Z/ ZZero clearing 0Short-circuit zero clearing 0Range mode Automatic, manual ,Test portTwo ports 2Display LED display, frequency 4 digits, impedance ... frequency: 400Hz, 1kHz 400Hz-1kHzManual adjusting: 20Hz-4kHz 20Hz-4kHzSweep range: 50Hz-3999Hz 50Hz-3999HzFrequency precision +/-1HzTest current 100mA, 50mA, ... -2893A Speak tester,400Hz,1KHz fixed freq,20Hz-4Khz manual adjusting, 50Hz-3999Hz sweep range