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Air‑fuel ratio meter, which is widely used in all 12V cars with narrow band oxygen sensors. Easy installation using English user manual. Professional installation is strongly recommended. There is a sensor in the package, which provides great convenience for your use. High‑quality plastic material, strong, corrosion‑resistant and durable, not easy to damage the car. Smoked lenses during the day, clear and bright LED display at night, easy to read the data.