What tool is commonly used for routine maintenance checks?

A multimeter is a versatile tool commonly used for routine maintenance checks because it can measure voltage, current, and resistance in electrical circuits. This makes it essential for diagnosing electrical issues and ensuring that systems are operating within specified limits. Routine maintenance often requires checking electrical connections, power outputs, and component integrity, which the multimeter effectively facilitates.

While other tools listed, such as a torque wrench, pressure gauge, and caliper, serve specific functions—like measuring tension in bolts, checking fluid pressures, and assessing dimensions—they typically do not have the broad application that a multimeter offers for general maintenance checks. The primary role of these other tools is more specialized, focusing on mechanical tension, fluid mechanics, and precise measurements, respectively, rather than overall electrical diagnostics. Thus, for general routine maintenance that encompasses a wide range of checks, the multimeter stands out as the most appropriate choice.