What type of equipment uses a hand-driven generator?

The correct choice, a testing device, is a hand-driven generator's primary application in the field of electrical work. These generators are commonly used to produce a small amount of electrical power for the purpose of testing equipment and circuits.

When technicians need to perform tests on devices where external power is unavailable or impractical, a hand-driven generator can efficiently provide the necessary power. This makes it an essential tool for validating the functionality and safety of various electrical systems.

The other options do not capture this specific application accurately. Measuring devices typically rely on steady, continuous power sources rather than being powered by temporary hand-generated energy. Power generation devices generally refer to larger, powered systems designed to supply electricity to appliances or infrastructure, which would not involve manual operation. Control equipment usually integrates into systems for managing or directing power flow rather than producing it independently.