What is a required item in an inspection bay for measuring tire pressure?

A tire pressure gauge is essential in an inspection bay for measuring tire pressure because it provides an accurate reading of the air pressure within a tire. Proper tire pressure is crucial for vehicle safety and performance, affecting handling, fuel efficiency, and overall stability of the vehicle. During a state inspection, ensuring that tires are inflated to the manufacturer's recommended pressure is a significant part of maintaining optimal safety standards.

The other items listed serve different purposes and are not related to measuring tire pressure. A window tint meter is used to measure the percentage of light that can pass through tinted windows; a disc micrometer is a tool used to measure thickness and is commonly used in mechanical or engineering settings; a floor jack is used for lifting a vehicle for service but does not provide any information regarding tire pressure. Therefore, the tire pressure gauge is the correct option, as it directly pertains to the task of measuring tire pressure, which is necessary for safely operating a vehicle.