- The 1.2-in-1 car meter provides real-time monitoring of both air-fuel ratio and battery voltage, ensuring you can easily keep track of your vehicle's performance. - Constructed from high-quality plastics, this gauge is designed for exceptional durability and resistance to aging, making it a reliable addition to your vehicle. - By accurately displaying vital metrics, this meter helps enhance vehicle performance, leading to a smoother and safer driving experience. - The 52mm/2in universal gauge is compatible with a variety of vehicles, including 12.0V motorcycles, cars, trucks, and gasoline engines, making it a versatile choice for different automotive applications. Practical use scenarios include: 1. Tuning and Maintenance: Use the air-fuel ratio feature to optimize engine tuning, ensuring your vehicle runs efficiently and reduces emissions. 2. Battery Health Monitoring: Keep an eye on battery voltage during long trips or in vehicles that are not used often, allowing you to prevent battery failure and ensure reliability. 3. Performance Testing: Connect the gauge during performance tests or modifications to immediately see the effects on air-fuel ratio and battery status, helping you make informed decisions. This product combines functionality, compatibility, and quality, making it an essential tool for any vehicle owner looking to improve performance and safety.