... controlled oscillator, Three working modes MCH-2893A Speaker Tester, impedance test ModelMCH2893ATest parameterImpedance /Z/ ZZero clearing 0Short-circuit ... portTwo ports 2Display LED display, frequency 4 digits, impedance 4 digits LED 4 4Test signal Test frequency Fixed ... 100mA, 50mA, 10mA, 1mA, 0.1mACurrent precision +/-5%Impedance test range0.1Ω-20kΩPrecision+/-0.5% reading +/-1digitComparator ...