What tool is essential for checking tire tread depth?

A tire tread depth gauge is specifically designed to measure the depth of tire tread accurately. This tool provides a precise reading of how much tread is left on the tire, which is crucial for assessing tire wear and ensuring adequate performance and safety on the road. Proper tread depth is essential for traction, particularly in wet conditions, and helps prevent hydroplaning.

While other tools, such as a digital gauge or a pressure gauge, may have their own uses in tire maintenance, they do not specifically measure tread depth. A pressure gauge measures tire inflation pressure, which is a different aspect of tire health. Similarly, a ruler can give a rough estimate of tread depth if marked correctly, but it lacks the precision and ease of use that a dedicated tire tread depth gauge provides. Thus, for accurate and reliable measurements, the tire tread depth gauge is the essential tool in this context.