What type of device is a solenoid type tester?

A solenoid type tester is a specific instrument that is designed to check the presence of electrical power in circuits. It operates by utilizing a solenoid, which is an electromagnetic device. When the tester's probe comes into contact with a live electrical connection, it activates the solenoid, causing it to either move or produce an audible signal, verifying that electrical power is present.

The solenoid type tester functions primarily as an electrical power circuit tester, making option B the correct answer. It is important to recognize the role of this device in diagnostics and troubleshooting of electrical circuits, as it helps technicians ensure circuits are energized and can indicate the status without needing to measure voltage or current directly.

Other options, while related to electrical testing, do not accurately describe the primary function of a solenoid type tester. Measurement of voltage or current pertains to different instruments that might not provide the functionality of detecting circuit power directly. Similarly, a tool for repairing electrical circuits implies a device that alters circuit components, rather than testing them for function, which is not the primary capability of a solenoid type tester.