___ are used to indicate exactly when a voltage change took place and for what period of time.

Recording meters are designed specifically to track and record voltage changes over time, providing a detailed history of voltage fluctuation. These devices are particularly useful for monitoring electrical systems, as they can pinpoint not only when a voltage change occurs but also how long it lasts. This capability is essential for diagnosing electrical issues, evaluating system performance, or ensuring compliance with safety standards.

While voltage testers are useful for checking the presence of voltage, they do not retain information or indicate the timing of voltage changes. Voltmeters with MIN MAX functionality can show the minimum and maximum voltage recorded, but they do not provide a continuous record over time. Multimeters, on the other hand, serve a wide range of measurement functions including voltage, current, and resistance, but they also lack the continuous recording capability that recording meters offer. Thus, the ability to log specific changes in voltage at precise intervals is what makes recording meters the correct choice for this question.