1pcs Speaker Polarity Tester PH Phase Meter Phasemeter FH-168 Car Audio System/Car Electronics Speaker Boxes.

 Feature: 1) new and high quaity. 2) Easy to operate, simple and practical. 3) Perfect for safely troubleshooting and testing audio s. 4) This phase meter can test all speakers of all car, such as small treble, door speakers, subwoofer, etc. How to use tester? Section 1: left noise signal Section 2: right channel noise signal Section 3: phase test signal. Section 4: phase test signal. Adjustment of speaker wiring: After the audio is installed, put the test CD into the host first, and adjust the volume output to the appropriate position. Then follow the steps below. -Step 1: Play section 1 and 2. Check if the left and right channels are reversed when connected. -Step 2: Play section 3 and 4. Check whether the phase of the left and right channel speakers is correct. -Place the front end of the phase meter (with a microphone in the instrument) close to the speaker under test, press the power switch of the phase meter, the green light flashes three times and the red light flashes once, indicating that the speaker output is positive phase. The green light flashes once and the red light flashes three times, indicating that the output is negative phase. -If the phase is wrong, you can reverse the wiring at both ends of the speaker. -The yellow light indicates that the battery of the phase meter is low, and the battery needs to be replaced. Specification: Condition: new Main Color:Black Material: Plastic Size: approx.10.8x7x2.4cm(4.25x2.76x0.94inch)(LxWxH) Powered By: 1 x 9V 6F22 Battery (Not included) Compatible With: fit for all car Package Include: 1 x PH Phase Meter(Battery is not included) 1 x Test CD Note: 1) All dimensions are measured by hand, there may be small deviations. 2) Color may vary slightly due to the color setting of each individual monitor.