Explanation: A logic probe is specifically designed to indicate the high (logic 1) and low (logic 0) voltage states present in digital circuits. It typically uses LED indicators to show these states, and often a third indicator for pulsing or undefined states. This makes it ideal for troubleshooting digital logic, which is fundamental in many amateur radio transceivers and accessories. An ohmmeter measures resistance, not voltage states. A megger is a high-voltage ohmmeter used to measure very high resistances, typically for insulation testing, and is completely unsuitable for low-voltage digital circuits. A signal strength meter measures the relative power of radio frequency (RF) signals, which is unrelated to DC voltage levels in digital logic.