ลําโพง Polarity Tester เครื่องวัดค่า Ph / เฟสมิเตอร์สําหรับรถยนต์

Black Speaker Polarity Tester PH Phase Meter Phasemeter for Auto Car Product Name: PH Phase Meter; Material: Plastic,Metal Package Content: 1 x PH Phase Meter Powered By: 1 x 9V 6F22 Battery(not included) Perfect for safely troubleshooting and testing audio systems. This phase meter can test all speakers of all car, such as small treble, door speakers, subwoofer, etc.