What do you call a pocket-size tool used to test the line wire or circuit if

there is current in it?

It is an instrument used for making precise linear measurements of dimensions such as diameter, thickness, and lengths of solid bodies.

This refers to the physical size and current carrying capacity of the wire. A fixed numerical designation is given to it that is inversely proportional to the diameter of the conductors.

It is used to measure the length in both metric and customary units.

It is an instrument used to measure the amount of electrical current intensity in a circuit. The unit of measure is ampere (a). It is connected along or series to the circuit.

It is an instrument used to measure the electrical pressure or voltage of a circuit. The unit of measure is volt (v). This is connected across or parallel to the circuit.

It is a measuring tool used to measure the length of an object in centimeters and inches.

It is used to measure the current flowing in a conductor. It is clamped or hanged in a conductor.

It is used to measure the voltage, resistance and current of a circuit. It is connected in parallel or series with the circuit depending on what to measure.

It is an instrument for measuring the electric power in watts of any given circuit.