Specification:
Condition: Brand New
Material: Plastic
Color: Black + Silver
Size: As Picture Shown
Built-in Battery: 1 x 9V 220mAh battery
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
section 2: right channel noise
section 3: phase test
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 , 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 x Phase Meter
1 x CD