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TH2893 is an impedance meter specially designed for speakers and magnetic heads of impedance measurement. TH2893 adopts the constant current measurement method under the specified current and frequency which are described in the speaker and magnetic head impedance measurement standard printed by the Industry Ministry. With the use of digital technology, measurement accuracy and performance have been greatly improved and operation is more convenient. TH2893 can be widely use for incoming inspection, product line quality control and experiment and study use. Sometimes it can also be used for general L/C/R impedance measurement.