The Snap-on GA3640 dial test indicator is a set of tools designed for automotive use. The brand, Snap-on, is known for high-quality hand tools and this set specifically includes SAE measurements. The GA3640 set includes a dial test indicator, which is a precision tool used for measuring small distances or angles with high accuracy. This tool is commonly used in automotive shops for tasks that require precise measurements, making it a valuable addition to any mechanic’s toolkit.