Workshop Essentials: Scan Tool, Multimeter, or Both?

Every repair bay needs reliable diagnostic equipment, but the best choice depends on the work. A scan tool reads fault codes, live data, adaptation values, and sometimes performs component tests or coding. It is excellent for modern engine, transmission, and body electronics. A multimeter measures voltage, resistance, current, and continuity, making it ideal for checking power supplies, grounds, sensors, and wiring faults. Neither tool replaces the other. A scan tool may show an implausible sensor value, but a multimeter proves whether the wiring or sensor is actually faulty. An oscilloscope adds another level by showing signal shape, timing, and noise. When reviewing tools, consider vehicle coverage, update policy, screen quality, speed, and support. Cheap tools can be useful for basic checks, while professional workshops need stable software and reliable adapters. The strongest setup combines a capable scan tool, a quality multimeter, and a technician who knows how to interpret results.