Start by clarifying your main tasks: automotive diagnostics, electrical testing, or general measurements. Check the essential capabilities you’ll use—voltage, current, resistance, and any additional functions—and ensure the device offers adequate accuracy within those ranges. Look for a rugged, portable design (ABS plastic housings are common) with a clear display and reliable power options for on-site use. Consider brand compatibility so you can easily find probes and accessories that fit your device. For automotive work, you might lean toward a dedicated 12V battery tester or a compact car diagnostic kit, while electronics work benefits from a pocket digital multimeter that’s easy to carry.