MCH-2893A Double display windows of frequency and impedance Internal voltage-controlled oscillator, Three ... zero clearing 0Range mode Automatic, manual ,Test portTwo ports 2Display LED display, frequency 4 digits, impedance 4 digits LED 4 4Test signal Test frequency ... ,MCH-2893A Speak tester,400Hz,1KHz fixed freq,20Hz-4Khz manual adjusting, 50Hz-3999Hz sweep range