SOLUTION

A single instrument that can measure voltage, current, resistance, diode forward voltage drop and transistor gain is called MULTIMETER.

Multimeter:

• A multimeter is an electronic instrument. It is mainly used to measure the three basic electrical characteristics of voltage, current, and resistance.
• It can also be used to test continuity between two points in an electrical circuit.
• The multimeters can not be used to measure electrical quantities such as frequency, charge, etc.
• The multimeter has multi functionalities like, it acts like ammeter, voltmeter, and ohmmeter.
• It is a handheld device with a positive and negative indicator needle over a numeric LCD digital display.
• Multimeters can be used for testing batteries, household wiring, electric motors, and power supplies.