Which meter can check the current value of a circuit without interrupting it?

The clamp-on ammeter is specifically designed to measure the current flowing through a conductor without the need to disconnect it from the circuit. This is achieved through the use of a magnetic field sensor that detects the magnetic field generated by the current. By clamping around the wire or cable, the device can provide an immediate reading of the current value, allowing for safe and efficient monitoring.

In contrast, a digital multimeter and an analog ammeter typically require the circuit to be opened in order to measure current directly. This can disrupt the circuit's operation and potentially cause safety issues. Infrared thermometers, on the other hand, measure temperature by detecting infrared radiation and are not suitable for current measurement in electrical circuits. Therefore, the clamp-on ammeter stands out as the ideal tool for non-intrusive current measurements in live circuits.