1. Made of durable plastic material ensures dependable strength and strong durability. 2. Precisely machined and with strict quality control standards, through professional process and treatment. 3. Long life service, durable , with strong structure and high strength. 4. Powered by 6F22 9V lithium battery (not included). 5. This phase meter can test all speakers of all car, such as small treble, door speakers, sub-woofer, etc.
