... Tester, impedance test ModelMCH2893ATest parameterImpedance /Z/ ZZero clearing 0Short-circuit zero clearing 0Range mode Automatic, manual ,Test portTwo ports ... , impedance 4 digits LED 4 4Test signal Test frequency Fixed frequency: 400Hz, 1kHz 400Hz-1kHzManual adjusting: 20Hz-4kHz ... Speaker Impedance Tester,MCH-2893A Speak tester,400Hz,1KHz fixed freq,20Hz-4Khz manual adjusting, 50Hz-3999Hz sweep range ...