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The simplest built-in meters have a cell pointing directly at the subject from above or around the camera lens and a moving needle read-out on top of the camera body which needs translating into shutter/aperture settings. Most meters however, are directly coupled to one or all exposure controls.

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This is the viewing screen from a 35 mm camera tat gives information on the exposure, aperture and shutter,

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This is the viewing screen from a 35 mm camera tat gives similar information on the exposure, aperture and shutter but is communicated through LEDs.

These meters often use cells, which read from the image projected through the lens. The cells are usually CdS type or the newer fast reacting silicon. This meter reading is shown in the viewfinder as a mechanical needle or LED display. Some cameras with this type of meter display all kinds of information through the viewfinder including shutter speeds, aperture, ASA, + and -. There are also beepers and buzzers incorporated to warn of low shutter speeds and the need for a tripod etc.