Car o Speaker Phase Meter, Auto Car o Speaker Horn Tester Phase Meter PH Phasemeter Phase Tester

Specification: Condition: 100% Brand New Material: Plastic Color: Black + Silver Size: As Picture Shown Package Weight: Approx. 139g/4.9oz #How to use the tester? the CD with the package include 4 section test music. section 1: left channel noise signal section 2: right channel noise signal section 3:  phase test signal section 4: same as section 3 Put it in car cd player, and play  section 1 or 2, check if left/right channel connection is right. Play section 3 or 4, the sound speaker will produce a fixed frequency signal, then press test button. 3 green light flash and 1 red light indicates that the speaker output is in positive phase correct connection); 3 red light flash and 1 green light indicates negative phase (reversed connection). Package List: 1 * Phase Meter 1 * CD