Analog ammeters are metered instruments that measure current flow in amperes.

Digital ammeters are instruments that measure current flow in amperes and display current levels on a digital display.

Clamp meters are ammeters that can measure current without the need to disconnect the wires where the measurement occurs.

Digital multimeters (or multi-meters) are used to measure electrical quantities such as voltage, current, resistance, frequency, temperature, capacitance, and time period measurements.

Analog multimeters are instruments that are used to measure electrical quantities such as voltage, current, resistance, frequency and signal power

Power frequency converters take electrical input power at one frequency and voltage and provide electrical output power at a different frequency and at a different or equal voltage.

Shunts resistors are connected in parallel with an instrument or component to divert electrical current.