Which device is most likely to include a light level meter?

A light level meter is a device specifically designed to measure the intensity of light in an environment. Cameras are commonly equipped with built-in light meters to help determine the proper exposure settings based on the available light. This functionality is critical for photographers, as it allows them to adjust aperture, shutter speed, and ISO settings to achieve the desired image quality.

In contrast, while thermometers, microscopes, and voltmeters serve specific measurement purposes related to temperature, magnification, and electrical voltage respectively, they do not typically incorporate a mechanism to measure light levels. This makes cameras the most relevant choice for including a light level meter, as their performance directly depends on measuring and responding to varying light conditions.