Features: Achieve optimalengine combustion efficiency with the 30 4110 UEGOwideband O2 air fuel ratio gauge. This advanced sensor technology ensures precise air fuel ratio measurements, while the digital display provides real time readings for quick and easy monitoring. Designed for automotive enthusiasts, performances tuners, and professional technicians who want to optimize engine performances and diagnose fuel system issues. Whether you're fine tuning your engine or conducting emissions testing, this wideband O2 gauge is a must have tool for accurate air fuel ratio measurement. Take control of your vehicle performances and emissions with the durable and corrosion resistant 30 4110 UEGOwideband O2 air fuel ratio gauge. Specifications: Material:Metal+Plastic Size:As Picture Shown Part Number:30-4110 Package Includes: 1 Set Air Fuel Ratio note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.