... digits, impedance 4 digits LED 4 4Test signal Test frequency Fixed frequency: 400Hz, 1kHz 400Hz-1kHzManual adjusting: 20Hz-4kHz 20Hz ... Ω-20kΩPrecision+/-0.5% reading +/-1digitComparator PASS, FAIL, sound alarm when qualified PASS,FAIL,*Specifications are subject to change witout ... Speaker Impedance Tester,MCH-2893A Speak tester,400Hz,1KHz fixed freq,20Hz-4Khz manual adjusting, 50Hz-3999Hz sweep range