... oscillator, Three working modes MCH-2893A Speaker Tester, impedance test ModelMCH2893ATest parameterImpedance /Z/ ZZero clearing 0Short-circuit zero ... LED display, frequency 4 digits, impedance 4 digits LED 4 4Test signal Test frequency Fixed frequency: 400Hz, 1kHz ... 100mA, 50mA, 10mA, 1mA, 0.1mACurrent precision +/-5%Impedance test range0.1Ω-20kΩPrecision+/-0.5% reading +/-1digitComparator PASS, ...