Which tool is utilized for determining tire pressure?

The tire pressure gauge is the correct tool used for determining tire pressure because it is specifically designed to measure the pressure of air within a tire accurately. This tool provides a reading in psi (pounds per square inch), which is crucial for ensuring that tires are inflated to the manufacturer's recommended specifications. Proper tire pressure is vital for safety, performance, and fuel efficiency.

The other tools listed are not appropriate for measuring tire pressure. A micrometer is used for measuring small distances or thicknesses with precision, which is irrelevant for tire inflation. A floor jack is designed to lift vehicles for maintenance purposes, such as tire changing, rather than measuring tire pressure. A brake drum gauge is intended for measuring the wear or thickness of brake drums, which does not relate to tire pressure at all. Thus, the tire pressure gauge is the essential tool needed for this specific task.