What is a common tool used by automotive technicians?

A multimeter is a crucial tool for automotive technicians because it allows them to measure various electrical properties such as voltage, current, and resistance. These measurements are vital for diagnosing electrical issues within a vehicle's systems, such as the battery, alternator, and various sensors. The multimeter can help technicians understand whether components are functioning properly or if they need to be repaired or replaced.

In contrast, while a laser cutter, welding machine, and 3D printer are valuable tools in the automotive industry, they are not as universally essential for day-to-day automotive diagnostics and repairs as a multimeter. Laser cutters and welding machines are often used for fabrication and structural repairs, whereas a 3D printer might be used for prototyping parts. However, diagnosing and troubleshooting electrical problems is a primary responsibility of technicians, making the multimeter an indispensable tool in their toolkit.