It is possible to measure DC and AC currents without having to turn off the power the aid of current clamps.

Any possible danger occurring, for example, a touch voltage can be ruled out.
Current clamps are often designed for additional functions such as: voltage, resistance and active-power measurements and so forth.

Simplicity and straightforward operation are a particularly distinguishing feature of current clamps. The conducting cable is completely enclosed by the current clamp. Subsequently, it is then possible to read the determined value via an analogue or digital display.

The measuring range categories (CAT) in which they can be used is given for all current clamps.
Acting in contravention of these categories can be fatal!